Remove release workflow since I'm not using it. (#74)

The release workflow that I'm currently deleting assumes I run `git pus --tags`
to run a release, collects the release notes and creates the release
afterwards.

However, I actually create the release using GitHub interface, so this always
fails.

Nevertheless, maybe later we should have a workflow that pushes all the
major.minor and major tags to the same major.minor.patch tag.

Signed-off-by: Mihai Maruseac <[email protected]>

Author: mihaimaruseac