doc: update api_assets README for new files

PR-URL: #53676
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Claudio Wunder <cwunder@gnome.org>

doc/api_assets/README.md

@@ -1,13 +1,7 @@
-# API Reference Document Assets
+# API documentation assets
 
-## api.js
-
-The main script for API reference documents.
-
-## hljs.css
-
-The syntax theme for code snippets in API reference documents.
-
-## style.css
-
-The main stylesheet for API reference documents.
+* [`api.js`](./api.js): This file contains all the JavaScript used throughout the documentation.
+* [`hljs.css`](./hljs.css): This CSS file is used for syntax highlighting styles in code blocks.
+* [`js-flavor-cjs.svg`](./js-flavor-cjs.svg): This SVG image represents the toggle between ESM and CJS (_CJS_)
+* [`js-flavor-esm.svg`](./js-flavor-esm.svg): This SVG image represents the toggle between ESM and CJS (_ESM_)
+* [`style.css`](./style.css): This CSS file contains the styling rules for the overall appearance of the API documentation.