Use GitHub API based sysl modules

[ChloePlanet]

Works with

• go run main.go --serve demo/demo.sysl --redoc --type=html
• make docker-mermaid-run

[codecov[bot]]

Codecov Report

Merging #189 into master will increase coverage by 0.44%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage   53.82%   54.27%   +0.44%     
==========================================
  Files           6        6              
  Lines         916      925       +9     
==========================================
+ Hits          493      502       +9     
  Misses        365      365              
  Partials       58       58              

Impacted Files	Coverage Δ
pkg/catalog/redoc.go	77.77% <ø> (ø)
pkg/catalog/spec.go	88.00% <100.00%> (+2.63%)	:arrow_up:

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