Documentation: Editing myconfig.py without changing directory

The previous page of instructions could mostly be copied and pasted into terminal and would work. This small change allows that to continue for this line.

Update formatting such as:
* missing clickable urls
* wrap in backticks special words (at least most of them)
* fix lists due to missing newlines
* wrap code sections into proper code blocks
* remove some improperly created headers

Rename files to lowercase extensions
Remove +x permissions set on files

Todo - look into legacy.md and extract data from it into another docs.

add a new joystick class known as RC3ChanJoystickController

Fix typos in setup_raspberry_pi.md

Fix these typos: it's/its, you're/your, insterting/inserting