Docs: remaining integration READMEs (#2885)

* docs: partytown README

* docs: sitemap README

* docs: tailwind README

* docs: turbolinks README

* chore: changeset

* update: make partytown 10% less fun

Co-authored-by: Nate Moore <natemoo-re@users.noreply.github.com>

* docs: add summaries for each integration

Co-authored-by: Nate Moore <natemoo-re@users.noreply.github.com>

.changeset/swift-pets-lick.md

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+---
+'@astrojs/partytown': patch
+'@astrojs/sitemap': patch
+'@astrojs/tailwind': patch
+'@astrojs/turbolinks': patch
+'@astrojs/lit': patch
+'@astrojs/preact': patch
+'@astrojs/react': patch
+'@astrojs/solid-js': patch
+'@astrojs/svelte': patch
+'@astrojs/vue': patch
+---
+
+Add README across Astro built-in integrations

packages/integrations/partytown/README.md

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+# @astrojs/partytown 🎉
+
+This **[Astro integration][astro-integration]** enables [Partytown](https://partytown.builder.io/) in your Astro project.
+
+Partytown is a lazy-loaded library to help relocate resource intensive scripts into a [web worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API), and off of the [main thread](https://developer.mozilla.org/en-US/docs/Glossary/Main_thread).
+
+## Installation
+
+There are two ways to add integrations to your project. Let's try the most convenient option first!
+
+### (experimental) `astro add` command
+
+Astro includes a CLI tool for adding first party integrations: `astro add`. This command will:
+1. (Optionally) Install all necessary dependencies and peer dependencies
+2. (Also optionally) Update your `astro.config.*` file to apply this integration
+
+To install `@astrojs/partytown`, run the following from your project directory and follow the prompts:
+
+```sh
+# Using NPM
+npx astro add partytown
+# Using Yarn
+yarn astro add partytown
+# Using PNPM
+pnpx astro add partytown
+```
+
+If you run into any hiccups, [feel free to log an issue on our GitHub](https://github.com/withastro/astro/issues) and try the manual installation steps below.
+
+### Install dependencies manually
+
+First, install the `@astrojs/partytown` integration like so:
+
+```
+npm install @astrojs/partytown
+```
+
+Then, apply this integration to your `astro.config.*` file using the `integrations` property:
+
+__astro.config.mjs__
+
+```js
+import partytown from '@astrojs/partytown';
+
+export default {
+  // ...
+  integrations: [partytown()],
+}
+```
+
+## Getting started
+
+Partytown should be ready-to-use with zero config. If you have an existing 3rd party script on your site, try adding the `type="text/partytown"` attribute:
+
+```diff
+-  <script src="fancy-analytics.js"></script>
++  <script type="text/partytown" src="fancy-analytics.js"></script>
+```
+
+If you open the "Network" tab from [your browser's dev tools](https://developer.chrome.com/docs/devtools/open/), you should see the `partytown` proxy intercepting this request.
+
+[Head to the Partytown docs](https://partytown.builder.io/configuration) for configuration options and more usage examples. You can also check our [Astro Integration Documentation][astro-integration] for more on integrations.
+
+[astro-integration]: https://docs.astro.build/en/guides/integrations-guide/
+[astro-ui-frameworks]: https://docs.astro.build/en/core-concepts/framework-components/#using-framework-components

packages/integrations/sitemap/README.md

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+# @astrojs/sitemap 🗺
+
+This **[Astro integration][astro-integration]** generates a sitemap for your Astro project.
+
+Sitemaps outline all of the pages, videos, and files on your site. Search engines like Google read this file to crawl your site more efficiently. [See Google's own advice on sitemaps](https://developers.google.com/search/docs/advanced/sitemaps/overview) to learn more.
+
+## Installation
+
+There are two ways to add integrations to your project. Let's try the most convenient option first!
+
+### (experimental) `astro add` command
+
+Astro includes a CLI tool for adding first party integrations: `astro add`. This command will:
+1. (Optionally) Install all necessary dependencies and peer dependencies
+2. (Also optionally) Update your `astro.config.*` file to apply this integration
+
+To install `@astrojs/sitemap`, run the following from your project directory and follow the prompts:
+
+```sh
+# Using NPM
+npx astro add sitemap
+# Using Yarn
+yarn astro add sitemap
+# Using PNPM
+pnpx astro add sitemap
+```
+
+If you run into any hiccups, [feel free to log an issue on our GitHub](https://github.com/withastro/astro/issues) and try the manual installation steps below.
+
+### Install dependencies manually
+
+First, install the `@astrojs/sitemap` integration like so:
+
+```
+npm install @astrojs/sitemap
+```
+
+Then, apply this integration to your `astro.config.*` file using the `integrations` property:
+
+__astro.config.mjs__
+
+```js
+import sitemap from '@astrojs/sitemap';
+
+export default {
+  // ...
+  integrations: [sitemap()],
+}
+```
+
+## Getting started
+
+`@astrojs/sitemap` requires a deployment / site URL for generation. Add your site's URL under your `astro.config.*` using the `buildOptions.site` property:
+
+__astro.config.mjs__
+
+```js
+import sitemap from '@astrojs/sitemap';
+
+export default {
+  // ...
+  buildOptions: {
+    site: 'https://stargazers.club',
+  },
+  integrations: [sitemap()],
+}
+```
+
+Now, [build your site for production](https://docs.astro.build/en/reference/cli-reference/#astro-build) via the `astro build` command. You should find your sitemap under `dist/sitemap.xml`!
+
+You can also check our [Astro Integration Documentation][astro-integration] for more on integrations.
+
+[astro-integration]: https://docs.astro.build/en/guides/integrations-guide/
+[astro-ui-frameworks]: https://docs.astro.build/en/core-concepts/framework-components/#using-framework-components

packages/integrations/tailwind/README.md

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+# @astrojs/tailwind 💨
+
+This **[Astro integration][astro-integration]** brings [Tailwind CSS](https://tailwindcss.com/) to your Astro project.
+
+Tailwind brings utility CSS classes for fonts, colors, layouts, transforms, and more to every Astro page or [UI component](https://docs.astro.build/en/core-concepts/framework-components/) in your project. It also includes extensive theming options for unifying your styles.
+
+## Installation
+
+There are two ways to add integrations to your project. Let's try the most convenient option first!
+
+### (experimental) `astro add` command
+
+Astro includes a CLI tool for adding first party integrations: `astro add`. This command will:
+1. (Optionally) Install all necessary dependencies and peer dependencies
+2. (Also optionally) Update your `astro.config.*` file to apply this integration
+
+To install `@astrojs/tailwind`, run the following from your project directory and follow the prompts:
+
+```sh
+# Using NPM
+npx astro add tailwind
+# Using Yarn
+yarn astro add tailwind
+# Using PNPM
+pnpx astro add tailwind
+```
+
+If you run into any hiccups, [feel free to log an issue on our GitHub](https://github.com/withastro/astro/issues) and try the manual installation steps below.
+
+### Install dependencies manually
+
+First, install the `@astrojs/tailwind` integration like so:
+
+```
+npm install @astrojs/tailwind
+```
+
+Then, apply this integration to your `astro.config.*` file using the `integrations` property:
+
+__astro.config.mjs__
+
+```js
+import tailwind from '@astrojs/tailwind';
+
+export default {
+  // ...
+  integrations: [tailwind()],
+}
+```
+
+## Getting started
+
+Tailwind's utility classes should be ready-to-use with zero config, including [preprocessor setup](https://tailwindcss.com/docs/using-with-preprocessors) and [production optimization](https://tailwindcss.com/docs/optimizing-for-production). Head to the [Tailwind docs](https://tailwindcss.com/docs/utility-first) to learn all of the options and features available!
+
+## Configuration
+
+Have a [custom theme](https://tailwindcss.com/docs/configuration)? Try adding a `tailwind.config.(js|cjs|mjs)` file to the base of your project. You can also specify a custom config file using this integration's `config.path` option:
+
+__astro.config.mjs__
+
+```js
+import tailwind from '@astrojs/tailwind';
+
+export default {
+  // ...
+  integrations: [tailwind({
+    config: { path: './custom-config.js' },
+  })],
+}
+```
+
+We will provide a `content` property to your config to enable Tailwind across all Astro files and [UI framework components](https://docs.astro.build/en/core-concepts/framework-components/). To remove this default, opt-out via the `config.applyAstroPreset` integration option:
+
+__astro.config.mjs__
+
+```js
+export default {
+  // ...
+  integrations: [tailwind({
+    config: { applyAstroPreset: false },
+  })],
+}
+```
+
+You can also check our [Astro Integration Documentation][astro-integration] for more on integrations.
+
+[astro-integration]: https://docs.astro.build/en/guides/integrations-guide/
+[astro-ui-frameworks]: https://docs.astro.build/en/core-concepts/framework-components/#using-framework-components

packages/integrations/turbolinks/README.md

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+# @astrojs/turbolinks ⚡️
+
+This **[Astro integration][astro-integration]** brings [Turbo](https://github.com/hotwired/turbo) to your Astro project.
+
+Turbolinks is a plug-and-play solution to bring single page app (SPA) routing to your site. This brings performant navigation without the added complexity of a client-side JavaScript framework.
+
+## Installation
+
+There are two ways to add integrations to your project. Let's try the most convenient option first!
+
+### (experimental) `astro add` command
+
+Astro includes a CLI tool for adding first party integrations: `astro add`. This command will:
+1. (Optionally) Install all necessary dependencies and peer dependencies
+2. (Also optionally) Update your `astro.config.*` file to apply this integration
+
+To install `@astrojs/turbolinks`, run the following from your project directory and follow the prompts:
+
+```sh
+# Using NPM
+npx astro add turbolinks
+# Using Yarn
+yarn astro add turbolinks
+# Using PNPM
+pnpx astro add turbolinks
+```
+
+If you run into any hiccups, [feel free to log an issue on our GitHub](https://github.com/withastro/astro/issues) and try the manual installation steps below.
+
+### Install dependencies manually
+
+First, install the `@astrojs/turbolinks` integration like so:
+
+```
+npm install @astrojs/turbolinks
+```
+
+Then, apply this integration to your `astro.config.*` file using the `integrations` property:
+
+__astro.config.mjs__
+
+```js
+import turbolinks from '@astrojs/turbolinks';
+
+export default {
+  // ...
+  integrations: [turbolinks()],
+}
+```
+
+## Getting started
+
+Turbo links, frames, and more should be ready-to-use with zero config. For instance, try navigating between different pages via links. You should no longer see browser refreshes! You will also find each page request passing through `turbolinks` under the "Network" tab in [your browser's dev tools](https://developer.chrome.com/docs/devtools/).
+
+Head to [the Turbo handbook](https://turbo.hotwired.dev/handbook/introduction) for all options and features available. You can also check our [Astro Integration Documentation][astro-integration] for more on integrations.
+
+[astro-integration]: https://docs.astro.build/en/guides/integrations-guide/
+[astro-ui-frameworks]: https://docs.astro.build/en/core-concepts/framework-components/#using-framework-components