Fix install for Linux Ubuntu (qmk#7520)

* Fix linux install for Ubuntu. It failed due to sh not supporting [ and pip being seperate from python3

* Adapted install function according to feedback

* Fix style

Add pep8-naming to our python linting

Specify Arm GCC 8 in macOS install script (qmk#7509)

Use os.chdir for `qmk docs` instead of a custom HTTP request handler (q…

…mk#7493)

Fix output file permissions when using docker build. (qmk#7378)

Install bootloadHid as part of qmk_install (qmk#7463)

* Install bootloadHid on macos

* Install bootloadHid on windows

* Highlight bootloadHID is now installed in docs

* Update udev rules for bootloadHID

* Install bootloadHid on some distros

* fix caterina udev filename

Fix typos in stale.yml (qmk#7489)

[Core] Remove PROGRAM_CMD in mcu_selection.mk for 32A (qmk#7482)

Set up language fallback for docs, and update translation guidelines (q…

…mk#7403)

* Set up language fallback for docs, and update translation guidelines

* Title Case

* Add ID example

* Link to emoji flag cheatsheet

* Move docs preview section to contributing.md

* Point to docs preview in the readme

Remove CR when computing BOOTLOADER_SIZE. (qmk#7453)