Convert docs to DocC

[fpseverino]

• Add DocC catalogs for every target and update old docs to be DocC compatible

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.27%. Comparing base (b2c85c9) to head (20bd046).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #112   +/-   ##
=======================================
  Coverage   82.27%   82.27%           
=======================================
  Files          58       58           
  Lines         790      790           
=======================================
  Hits          650      650           
  Misses        140      140           

Files with missing lines	Coverage Δ
...s/ImperialCore/Middleware/ImperialMiddleware.swift	0.00% <ø> (ø)
Sources/ImperialCore/RoutesBuilder+oAuth.swift	92.85% <ø> (ø)