if you forget .gitignore file in the first place, want to remove files from repo that should be ignored

$ git rm --cached -r .  
$ git add .

İf you want move repo to another server

$  git clone --mirror <URL to my OLD repo location>
$  cd <New directory where your OLD repo was cloned>
$  git remote set-url origin <URL to my NEW repo location>
$  git push -f origin