fix: remove non-functional source .common-repo.yaml

Source-declared include/exclude/rename are not wired into the
common-repo 0.27.0 pipeline (see common-repo/common-repo#226).
Consumers must use with: clause for now.

.common-repo.yaml

@@ -1,10 +0,0 @@
-# Source-level config: exclude everything except src/.
-# Rename strips the src/ prefix for consumers.
-- exclude:
-    - "README.md"
-    - "LICENSE"
-    - ".github/**"
-    - "commitlint.config.js"
-    - ".releaserc.yaml"
-- rename:
-    - "^src/(.+)": "%[1]s"