CI: remove comment-bot

since default github.token cannot trigger workflows

Author: casperdcl

.github/workflows/comment-bot.yml

@@ -44,6 +44,3 @@ Tests and deployment are handled automatically by continuous integration. Simply
 tag a commit `v{major}.{minor}.{patch}` and wait for a draft release to appear
 at <https://github.com/iterative/shtab/releases>. Tidy up the draft's
 description before publishing it.
-
-Note that tagging a release is possible by commenting `/tag vM.m.p HASH` in an
-issue or PR.