core: Fix build config in protocol.mk (qmk#7620)

Backports commits from tmk_keyboard

Also fix flash

Add JSON keymap to prereq list of C keymap

This ensures the C keymap is rebuilt when the JSON keymap changes.

[Keymap] Added my customized 40% layout (qmk#7555)

* Formatting of Contra readme.

* Initial version of my custom keymap

* Move TODOs to readme

* Add comment

* Nuke Plover layer

* Port changes to other layers

* Finished work on my own layout for now

* Add layout image

* Processed comments from review

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