Document user configurable settings

[jdeanwallace]

Resolves https://github.com/tiny-pilot/tinypilot/issues/1573

Since winning the war on Ansible, we've dropped support for many TinyPilot settings that were configurable via /home/tinypilot/settings.yml.

Apart from this blog post (/whats-new-in-2022-05/) we haven't really documented (publicly) which settings are supported, deprecated, and unsupported. This PR does just that:

• Document preview: docs/user-configurable-settings.md

Notes

1. The list of supported settings, were compiled from
   • app/update/settings.py#L76-L86
2. The list of deprecated settings, were compiled from a combination of
   • debian-pkg/opt/ustreamer-launcher/launch#L95-L101
   • "Unsupported vars" from https://github.com/tiny-pilot/tinypilot-pro/issues/972#issue-1791847326
3. The list of unsupported settings, were compiled from a combination of
   • 2.6.0/ansible-role/defaults/main.yml
   • 2.6.0/ansible-role-ustreamer/defaults/main.yml
   • blog/whats-new-in-2022-05/index.md#enabling-h264-video

Resources used

• https://tinypilotkvm.com/pro/changes#261
• https://github.com/tiny-pilot/tinypilot-pro/issues/972
• blog/whats-new-in-2022-05/
• 2.6.0/ansible-role/defaults/main.yml
• 2.6.0/ansible-role-ustreamer/defaults/main.yml

[jdeanwallace]

Automated comment from CodeApprove ➜

⏳ @jotaen4tinypilot please review this Pull Request