Revert "gitignore: ignore mako's config because flavours"

Revert "gitignore: ignore mako's config because flavours"

This reverts commit 9fec0d291c91484e83b573e528eff11941df0a41.

from https://stackoverflow.com/questions/9794931/keep-file-in-a-git-repo-but-dont-track-changes :
git has a different solution to do this. First change the file you do not want to be tracked and use the following command:
git update-index --assume-unchanged FILE_NAME
and if you want to track the changes again use this command:
git update-index --no-assume-unchanged FILE_NAME