Draft: Techdoc redesign

Please do not merge yet!

• 👉 Proposed tree structure
  • Older version of the same
• With !291 (merged), @jandt-desy cleaned up a bit and moved content to the new places, where it seemed somewhat fitting.
  • However, several stuff is yet unaccounted for, and now put to _homeless

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• Find a place for homeless stuff
• Create menu that fits to the new structure
• Put at least stub content to the (many) empty places
• Ensure that old links work: Install redirects