Build documentation

[esmarkowski]

I've switched from yardoc, to tomdoc, back to rdoc. I'm kinda disappointed in the output options after all these years.

I'm going to use docsify to host docs on gh-pages branch.

I want the build process to be automated.

Docs should include:

• docs/guides/

• docs/doc/

• docs/

• Rdoc should replace docs/doc and be formatted as markdown on build

[esmarkowski]

build_docs GitHub action

on: :pull_request 

  build_docs > 
    checkout gh_pages
    run rdoc > docs/doc
    insert _sidebar.md in docs/doc?

• Assumes that docs/ is in main branch (docsify template)

[esmarkowski]

Generates RDoc markdown and creates _sidebar.md for each directory tree.

Need to update template instead of using rdoc-markdown because it's goofy.

rake documentation:generate

rake documentation:build_sidebar