June documentation update

[Dewb]

todo list from may:

• add grid legends for remaining modules
• add download links for grid legends and quickstart patches
• add an additional teletype quick start focused on code editing (no triggers no grid)
• do a pass on headings/flow/etc.
• eliminate redundant info from README, redirect to docs site

[Dewb]

@dndrks I did a round of significant doc updates and edits. the private todo list I wrote for myself and meant to share earlier is above in the PR description. I think I've covered everything I wanted to do in this pass, feel free to suggest additional changes or enhancements!