Improve the documentation around deployment and usage
Description
The docs don't really have much in the way of information about deploying a non-test BuildGrid, so this MR adds a couple of more widely useful example configuration files.
The docs also never explicitly describe a workflow for demonstrating cache hits after doing a build, so this MR adds a brief description of how to do that in the RECC usage guide.
The "basic workflow" usage guide is also made discoverable and brought up to date.
Issues addressed
Closes #192 (closed)