Git gitignore untrack files

gitignore and untrack ignored files

1. create .gitignore file: e.g. echo .DS_Store >> .gitignore

# System OSX
.DS_Store

# Environment
.venv

# Specific folder
/data

# Mkdocs
/site/

1. untrack everything that is now in .gitignore:

   1. commit all changes
   2. remove everything from the repo: git rm -r --cached . (recursively remove all files from the index) or, remove a specific file: git rm --cached some.txt
   3. re add everything: git add .
   4. commit: git commit -m '.gitignore fix'

2. check files that are being ignored: git status --ignored