Update developer environment setup

[eslindsey]

On a fresh install of Debian 12, I had to fudge the Developer Environment Setup instructions, so I thought I'd make a list of what I did in case we want to update the docs.

• git clone git@github.com:lamemakes/pilot-drive.git
  I think this only works for someone with access to your account (via SSH key). At least, that's what happened when I forked it and tried to git clone from my repo (I checked and yours and mine are both set to "Public"). HTTP clone would probably work without credentials.
• Need to add "Install pip" (python3-pip for me)
• npm install --global yarn should have sudo in front of it
• Typo here pip install backend/ ("Invalid requirement: 'backend/'")
• The stuff we already know about with --break-system-packages for the two pip install commands
• make fails because No module named build (sudo apt install python3-build)
• make fails because ensurepip is not available (sudo apt install python3.11-venv)

I'm using a mix of python3- and python3.11-, and it works, but maybe should settle on one or the other.