docs: redesign table of content (#12647)

* implement toc

* added to projects

* fixes and adapt for references

* added product frontmatter

* remove action menu from 404 pages

www/apps/book/components/MDXComponents/index.tsx

@@ -1,10 +1,9 @@
 import type { MDXComponents as MDXComponentsType } from "mdx/types"
-import { Link, MDXComponents as UiMdxComponents } from "docs-ui"
+import { MDXComponents as UiMdxComponents } from "docs-ui"
 import Feedback from "../Feedback"
 
 const MDXComponents: MDXComponentsType = {
   ...UiMdxComponents,
-  a: Link,
   Feedback,
 }