docs for how to add a set of versioned docs

docs/workflows/add-versioned-docs.md

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+# Add a versioned docs to developer.hashicorp.com
+
+You must create PRs to update the `dev-portal` and `web-unified-docs` APIs to add a new set of versioned docs. 
+
+## Update the dev-portal API
+
+1. Create a new branch for your changes in the `github.com/hashicorp/dev-portal` repository. 
+1. In the `config/production.json` file, add a name for the new docs to the `"flags"."unified_docs_migraged_repos"` objects:
+
+   ```json
+   "flags": {
+		"enable_datadog": true,
+		"enable_io_beta_cta": true,
+		"enable_hvd_on_preview_branch": false,
+		"unified_docs_migrated_repos": [
+		   "<existing-docs>",
+         "<your-new-docs>"
+      ]
+   }
+   ```
+
+   Use a descriptive name. The API uses this string internally.
+
+1. Make the following changes to the `src/data/<product>.json` file:
+   - Add a base slug to the `"basePaths"` object. Take SEO into consideration when declaring the slug because it represents the first segment after the core product name in the URL, for example: `developer.hashicorp.com/terraform/<base-path-slug>`
+   - Add the base path slug to the `"docsNavItems"` object so that it appears in the navigation.
+   - Add an object with the following attributes:
+      - `iconName`: For documentation, specify `"docs"`. Refer to the web engineering team for details about other supported values.
+      - `name`: Declares the public name for the docs.
+      - `path`: Must match the value you specified for the `"basePaths"` and `"docsNavItems"` objects.
+      - `productSlugForLoader`: Must match the name you specified in the `"flags"."unified_docs_migraged_repos"` objects in the `config/production.json` file.
+
+      The following example adds the Terraform MCP server docs:
+
+      ```json
+      {
+	      "iconName": "docs",
+	      "name": "Terraform MCP Server",
+	      "path": "mcp-server",
+	      "productSlugForLoader": "terraform-mcp-server"	
+      }
+      ```
+
+1. Complete the following steps to create a homepage for the docs: 
+   1. Create the `dev-portal/src/pages/<main-product>/<new-docs>` directory path.
+   1. In the directory for the product docs, create a file named `[[...page]]].tsx`.
+   1. Add the following code to the new file:
+
+   ```typescript
+   /**
+   * Copyright (c) HashiCorp, Inc.
+   * SPDX-License-Identifier: MPL-2.0
+   */
+
+   import DocsView from 'views/docs-view'
+   import { getRootDocsPathGenerationFunctions } from 'views/docs-view/utils/get-root-docs-path-generation-functions'
+
+   const { getStaticPaths, getStaticProps } = getRootDocsPathGenerationFunctions(
+      '<main-product-eg-terraform>',
+      '<value-you-added-for-basePaths-and-docsNavItems>',
+      { projectName: '<name-for-the-docs-collection>' }
+   )
+
+   export { getStaticProps, getStaticPaths }
+   export default DocsView
+   ```
+
+Before merging these changes, make changes to the `web-unified-docs` API. Refer to the [Example PRs](#example-prs) for guidance. 
+
+## Update the web-unified-docs API
+
+1. Create a new branch for your changes in the `github.com/hashicorp/web-unified-docs repository` repository.
+1. Add the MDX files and a `nav.json` file for your new docs. 
+1. Add an entry for the GitHub labeler so that GitHub automatically adds labels to pull requests when someone updates files in your new directory. 
+   1. Open the `.github/labeler.yml` file.
+   1. Add an object using the following syntax:
+
+   ```yaml
+   <string-for-your-label>:
+     any:
+      changed-files:
+        any-glob-to-any-file: [
+          'content/<dir-for-your-collection>/**'
+      ]
+   ```
+
+1. If you need a specific team to act as reviewers, add the group to the repository `CODEOWERS` file. The following example adds the `team-docs-packer-and-terraform ` team to the MCP server documentation: 
+
+   ```text
+   content/terraform-mcp-server @hashicorp/team-docs-packer-and-terraform
+   ```
+
+1. Add an entry for your docs to the `productConfig.mjs` file. Use the following syntax:
+
+   ```mjs
+   '<name-you-declared-in-config/base.json-and-config/development.json-files': {
+		assetDir: 'img',
+		basePaths: ['<basePath-value-you-declared-in-basePaths-object'],
+		contentDir: '<dir-where-you-added-mdx-files>',
+		dataDir: 'data',
+		productSlug: '<main-product-slug>',
+		semverCoerce: semver.coerce,
+		versionedDocs: true,
+		websiteDir: 'website',
+	},
+   ```
+
+   The following example adds the MCP server:
+
+   ```mjs
+   'terraform-mcp-server': {
+		assetDir: 'img',
+		basePaths: ['mcp-server'],
+		contentDir: 'docs',
+		dataDir: 'data',
+		productSlug: 'terraform',
+		semverCoerce: semver.coerce,
+		versionedDocs: true,
+		websiteDir: 'website',
+	},
+   ```
+
+1. Duplicate the changes from step 5 to the `__fixtures__/productConfig.mjs` file in the root directory. This file is for testing purposes.
+
+Push your changes but do not merge until you've launched a preview to verify your updates. Refer to the [Example PRs](#example-prs) for guidance. 
+
+## Preview changes
+
+Normal Vercel previews use the production state of the dev-portal API. As a result, you have to manually instruct Vercel to preview content changes in the `web-unified-docs` repository that rely on changes you make to the dev-portal API. Before you continue, request developer permissions for Vercel so that you can create variables necessary for generating previews that involve dev-portal API changes.
+
+1. Log into Vercel and go into the dev-portal project.
+1. Click on **Settings**, then select the **Environment Variables** in the sidebar menu.
+1. Click the **Create** new tab. 
+1. Open the drop-down menu in the **Environments** section and disable **Development** so that only **Preview** is selected.
+1. Click **Select a custom Preview branch** and choose your dev-portal branch. 
+1. Set the new variable key to `UNIFIED_DOCS_API`.
+1. Open another browser window and go to your `web-unified-docs` PR. 
+1. In the **Vercel Previews Deployed** section, copy the URL of the **Unified Docs API preview** link, for example `https://web-unified-docs-beequ48j2-hashicorp.vercel.app/`.
+1. Set the `UNIFIED_DOCS_API` variable value to the **Unified Docs API preview** link and save the variable.
+1. Confirm that you want to redeploy the dev-portal branch preview when prompted. If Vercel does not prompt you, complete the following steps to redeploy the preview manually: 
+   1. Click the **Deployment** tab at the top of the page.
+   1. Find your preview and choose **Redeploy** from the ellipses menu.
+
+After each commit to your working `web-unifed-docs` PR, you must update the variable with the new preview URL and redeploy to see changes. 
+
+## Merge PRs
+
+When you are ready to publish your changes, merge the PRs in the following order:
+
+1. `web-unified-docs` 
+1. `dev-portal`
+
+## Redeploy the website
+
+After merging your changes, you must redeploy the website. If you do not have appropriate permissions, you can ask for assistance in the `#team-web-support` channel. This process takes approximately 10 to 15 minutes to complete. Verify that your changes appear. If you have any issues, reach out to `#team-web-support`.
+
+## Example PRs
+
+Refer to the following examples for guidance on how to update the APIs.
+
+### TF migrate
+
+- https://github.com/hashicorp/web-unified-docs/pull/555
+- https://github.com/hashicorp/dev-portal/pull/2808
+
+### MCP server
+
+- https://github.com/hashicorp/dev-portal/pull/2835
+- https://github.com/hashicorp/web-unified-docs/pull/949