Rename cvim tags

[tinywrkb]

~~Releases are not tagged.~~ I recommend using this chance to rename the cvim tags as there's only a single fork for vb4c atm.

#!/bin/bash

for tag in $(git tag -l); do
  git tag cvim-$tag $tag
  git tag -d $tag
done

for tag in $(git tag -l); do
  git push origin :refs/tags/${tag#cvim-}
done

git push --tags