Refactor docs

This MR contains the following changes.

• Move Doc component into index.ts
• Consistent component directories
  • search dir is renamed to Search
  • reference contains component named Ref.
  • remapper contains component named Ref.
• Consistent route nesting
  • Created package routes directory.
  • action contains pages based on the .mdx? files present.
  • remapper contains pages based on the .mdx? files present.
  • reference contains pages based on the .mdx? files present.
• Infer menu items from routes
  • Actions
  • Remappers
  • Reference
• Consistent breadcrumbs
  • Breadcrumbs on nested docs page contain link to parent docs page.
  • Link to parent pages, do not end with a /.
• Consistent ordering
• Consistent translations
• Consistent table of contents
• Correctly use plural in section names
• Links to docs are adjusted

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Before assigning a reviewer go through the following checklist, and make sure to test your changes manually (if possible).

• Make sure to read the CONTRIBUTING.md for best practices and guidelines.
• Make sure to put the merge request on draft: if it's not ready.
• If this merge requests closes an issue, make sure the merge request description contains, closes #the-issue-number.
• If this merge request only relates to an issue, refer to the issue with refs #the-issue-number.
• If there is no related issue, consider adding a description and add labels accordingly.
• If this is a bug fix, consider adding regression tests.
• If this is blocked by another merge request, make sure to make it depend.

TIP: Use ~ in the checklist item (like this - [~]) to strike it out if it's not applicable.