Refactor repo to basic bash setup approach

[fe51]

Hello there,

This repo has been out of use for a very long time. However, we need to make our raspberrypi setup efficient. The Ansible approach is certainly relevant, but to get off to a solid start, we're going to restart here with a bash script setup.
(The ansible appproach is kept in the ansible-archive branch, as we'll probably come back to Ansible later for its flexibility, robustness and better debugging quality.

This PR introduces the following modifications:

• deletes all Ansible related files
• Add bash scripts setup approach
• Documents the process in the readme
• Updates contributing

It has been tested to setup a Pyronear station.

However :

• Maybe "sudo apt update" and "sudo apt install docker-compose" are enough to install docker and makes curl -sSL https://get.docker.com | sh && sudo usermod -aG docker pi useless. It has to be tested soon.
• About cron tasks, the update_script has been simplified, the suggested command in Notion was not working.

Happy to discuss it ! Feedback is welcome !

[MateoLostanlen]

Hi @fe51 !

Thanks for this PR! It's globally ok for me. A few changes though:

• remove the ability to change PI_HOST
• No need to redefine the wifi or add a common wifi for debug in connection sharing
• no need to configure the pi on the command line, which will confuse people
• add pi imager screen

[MateoLostanlen]

I've just re-tested it and it works without a hitch, thanks for the PR! very happy to have it 😄