open source the docs for public edits via pulls

i think it'd be advantageous to open source the docs as well. for instance, i'd like to add install examples for arch linux to the the https://keybase.io/docs/command_line/prerequisites page. it would be great to just fork the docs, make some edits, then submit a pull request.

either way, thanx for the great tool!

Start with the linked prerequisites page at https://keybase.io/docs/command_line/prerequisites and determine where the documentation is maintained and how edits are currently published. Define a public fork-and-pull-request workflow, including the requested Arch Linux install examples; done means contributors can submit documentation changes through pulls.

Written by the indexing model from the issue text.