refactor: migrate API specs to OpenAPI 3.1.0 ♻️

[kareemmahlees]

• Makes the code gen process part of the code utilizing go generate. Now, swagger docs are formatted and generated, and GraphQL code is generated by running go generate.
• Uses scalar docs as the front end of swagger specs instead of the plain old swagger UI.

[codecov]

Codecov Report

Attention: Patch coverage is 1.17647% with 84 lines in your changes missing coverage. Please review.

Project coverage is 13.52%. Comparing base (f621bea) to head (b78eb5e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/gen/main.go	0.00%	40 Missing ⚠️
internal/graph/generated.go	0.00%	21 Missing ⚠️
internal/server.go	5.26%	16 Missing and 2 partials ⚠️
cmd/sqlite3.go	0.00%	2 Missing ⚠️
main.go	0.00%	2 Missing ⚠️
cmd/pg.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #12       +/-   ##
===========================================
- Coverage   88.30%   13.52%   -74.79%     
===========================================
  Files          14       23        +9     
  Lines         727     4783     +4056     
===========================================
+ Hits          642      647        +5     
- Misses         58     4106     +4048     
- Partials       27       30        +3     

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