Mega: Eliminate Ansible from the install process

[mtlynch]

We're now close to eliminating Ansible from TinyPilot's installer. This will have several benefits:

• Reduce complexity of the install
• Improve performance of the install
  • Boostrapping the Ansible environment takes 30-60 seconds
• Speed up development workflows
• Bring us much closer to offering offline upgrades

Remaining tasks

• [x] https://github.com/tiny-pilot/tinypilot/pull/1592
• [x] https://github.com/tiny-pilot/tinypilot/issues/1595
• [x] https://github.com/tiny-pilot/tinypilot/issues/1594
• [x] https://github.com/tiny-pilot/tinypilot/issues/1598
• [x] https://github.com/tiny-pilot/tinypilot/issues/1600
• [x] https://github.com/tiny-pilot/tinypilot/issues/1599