title: How to shrink the .git folder
body: <p>My current base has a total size of approx. 200MB.</p>
  <p>But my .git folder has an amazing size of 5GB (!). Since I push my work to an external server, i don't need any big local history...</p>
  <p>How can I shrink the .git folder to free up some space on my notebook? Can I delete all changes that are older, than 30 days?</p>