Improve Configure Grafana documentation

Description

Add images, add anchor links, move all of the Grafana installation instructions here, add a walkthrough section to give an idea of the big picture, update the Add Grafana Host section and images

Put an x in the boxes that apply

[ ] Feature (non-breaking change which adds functionality)
[ ] Bug Fix (non-breaking change that fixes an issue)
[ ] Breaking Change (feature/fix that causes existing features to not work as expected)
[x] Documentation

[ ] I have read the [contribute]contributing doc - tbd
[x] Classes, scripts, and environment variables follow existing naming convention
[x] Lint and Unit tests pass locally
[x] New features on hardware have been tested on a local Raspberry Pi
[x] Mention new programs/binaries if any must be installed along with this change
[x] Mention new environment variables if any have been added to hardware/env file
[x] Please make sure test coverage does not drop. If it does, please explain the reasons.
[x] Any new required python modules are added to the requirements.txt