refactor: Implement new site structure

[programmiri]

Description

This PR restructures the structure and navigation for our docs.

Decisions made with this PR

• structure in our directories matches the structure we apply in sidebar.js, that way navigation in files is more intuitive
• sidebar.js does not included categories with autogenerated-index other than for releases. This makes it more comfortable to organise the order of documents.
• we only include an entry index page for a category if it's needed, because it provides additional information or a needed overview

PR includes:

First bunch of commits is for creating new categories and move existing pages.

The commits are named Add new category <CATEGORY_NAME>

Each commit includes:

• creating of the new dir
• moving files and renaming if needed
• a change in current-routes.json that reflect the changes for the routes that are generated in build
• an entry in _redirects based on those route changes that redirect old links to new ones on the server

All commits on Feb 5, 2024 include smaller clean up and update tasks like:

• moving doc pages that where not in the original move
• removing unneeded directories and elements
• updating links
• adding a script to check for that all files in sidebar.js are actually there and no files in docs are missing in sidebar.js
• updating the markdown link checker

Out of scope for this PR

• style updates for sidebar: New sidebar layout (styles) #139
• changes to content (e.g. removing unneeded information, splittings docs in two new ones etc)

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[muralibasani]

Looks great to me.