Steps to improve documentation

[BentleyJOakes]

• Align installation steps in documentation with README.
  • Documentation should just point to README file in folder/repo. This prevents duplication of information.
• Add link to source code and issue tracker to first page of documentation
• Fix up documentation such that JSDoc can extract it
  • See about-getting-started.html for basic usage
  • See about-configuring-jsdoc.html for info about not ignoring files like _worker.js
  • See howto-commonjs-modules.html for info about comments in Node.js modules
• Investigate possibility of using sphinx-js to extract documentation into online docs
  • Automate this extraction (on ReadTheDocs side)
• Organize documentation based on principles from diataxis

[BentleyJOakes]

First two tasks handled in 177a0c0