docs: Move the docs and toturial directories to the root

[mnonnenmacher]

Move the docs and tutorial directories from the docusaurus directory to the root of the repository to make them easier to discover when looking at the repository.

[mnonnenmacher]

@tsteenbe This moves the docs and tutorial directories to the root. Regarding the renaming of the docusaurus directory I'd like some other opinions, e.g. from @sschuberth or @fviernau. For me "website" would be fine but I'm open to suggestions.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (dc6d4a9) 68.02% compared to head (9f5f9f0) 68.02%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7518   +/-   ##
=========================================
  Coverage     68.02%   68.02%           
  Complexity     2023     2023           
=========================================
  Files           343      343           
  Lines         16723    16723           
  Branches       2371     2371           
=========================================
  Hits          11375    11375           
  Misses         4364     4364           
  Partials        984      984           

Flag	Coverage Δ
funTest-docker	69.40% <ø> (ø)
funTest-non-docker	36.46% <ø> (ø)
test	35.51% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sschuberth]

For me "website" would be fine but I'm open to suggestions.

What I don't like so much about "website" is that IIUC the directory doesn't really contain the (generated) website, but the code of the framework to generate it. In that sense "docusaurus" was IMO more fitting. But I do not care all too strong either way.

[sschuberth]

Commit message typo in "toturial".