Suggestions for minor improvements to the documentation

While going through the documentation, I found some small issues that I do not know the exact answers to, so I wanted to leave them here for clarification before trying to fix these myself:

All in in 3. Tools and Environments:

• the links to "Installation Instructions" and "Resources" lead to non-existent pages, where should they lead instead?
• when using the nix setup, it seems to be necessary to follow the pico-examples readme first and install this:

sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib

• in the "Using VS Code" section it might be good to and another hint that nix develop needs to be executed first in the lf-3pi repository first as well.
• using screen may skip some outputs that are not shown on the computer's terminal. I don't know the exact reason why this is, but an explanation for that could help the reader.

Start in the documentation's "3. Tools and Environments" section, checking the "Installation Instructions," "Resources," "Using VS Code," and screen-related guidance. Verify the correct links and setup prerequisites, then confirm the explanation for missing screen output with the project maintainers. Done means each question has an agreed answer and the documentation reflects it.