refactor: Add more checks to pre-commit

Updated existing pre-commit hooks and added some new hooks:

- Remove trailing whitespace
- Ensure every non-empty file ends with a new line
- Check YAML file validity
- Prevent adding large files
- Ensure any scripts with shebangs are executable

Added a GitHub action to run pre-commit on every commit. Removed any
existing actions which duplicate pre-commit.

Ran pre-commit on the codebase.

app/boards/arm/nice60/README.md

@@ -1,9 +1,11 @@
 # nice!60
+
 ![nice!60](https://i.imgur.com/0YWv5PE.png)
 
 The nice!60 is a hotswap 60% made by Nice Keyboards. https://nicekeyboards.com/nice-60
 
 ## Building nice!60 ZMK firmware
+
 ```
 west build -p -b nice60
 ```