chore: revert owlbot main branch templates (#390)

* chore: revert owlbot main branch templates

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <[email protected]>

Author: 3 people

owlbot.py

@@ -100,25 +100,3 @@
 
 s.shell.run(["nox", "-s", "blacken"], hide_output=False)
 
-# ----------------------------------------------------------------------------
-# Main Branch migration
-# ----------------------------------------------------------------------------
-
-s.replace(
-  "*.rst",
-  "master",
-  "main"
-)
-
-s.replace(
-  "CONTRIBUTING.rst",
-  "kubernetes/community/blob/main",
-  "kubernetes/community/blob/master"
-)
-
-s.replace(
-  ".kokoro/*",
-  "master",
-  "main"
-)
-