doc: update modules sections

README.md

@@ -42,6 +42,7 @@
     - twind - [tw](https://github.com/tw-in-js/twind/tree/main/docs/tw.md) and [setup](https://github.com/tw-in-js/twind/tree/main/docs/setup.md)
     - [twind/colors](https://github.com/tw-in-js/twind/tree/main/docs/setup.md#colors) - the Tailwind v2 [extended color palette](https://tailwindcss.com/docs/customizing-colors#color-palette-reference)
     - [twind/css](https://github.com/tw-in-js/twind/tree/main/docs/css-in-js.md) - how to apply custom css
+    - [twind/observe](https://github.com/tw-in-js/twind/tree/main/docs/observe.md) - the base for [twind/shim](https://github.com/tw-in-js/twind/tree/main/docs/installation.md#twindshim) which can be used standalone
     - [twind/server](https://github.com/tw-in-js/twind/tree/main/docs/ssr.md) - how to extract the generated css on the server
     - [twind/sheets](https://github.com/tw-in-js/twind/tree/main/docs/sheets.md) - several additional sheet implementations that can be used with [setup({ sheet })](https://github.com/tw-in-js/twind/tree/main/docs/setup.md#sheet).
     - [twind/shim](https://github.com/tw-in-js/twind/tree/main/docs/installation.md#twindshim) - allows to copy-paste tailwind examples

docs/README.md

@@ -32,6 +32,7 @@ If you find any incorrect or missing documentation then please [open an issue](h
   - [twind/colors](./setup.md#colors) - the Tailwind v2 [extended color palette](https://tailwindcss.com/docs/customizing-colors#color-palette-reference)
   - [twind/css](./css-in-js.md) - how to apply custom css
   - [twind/server](./ssr.md) - how to extract the generated css on the server
+  - [twind/observe](./observe.md) - the base for [twind/shim](./installation.md#twindshim) which can be used standalone
   - [twind/sheets](./sheets.md) - several additional sheet implementations that can be used with [setup({ sheet })](./setup.md#sheet).
   - [twind/shim](./installation.md#twindshim) - allows to copy-paste tailwind examples