ci: auto-update vimdocs as well as readme

.github/workflows/update-readme.yml

@@ -20,6 +20,6 @@ jobs:
           git config user.name "Github Actions"
           git remote set-url origin https://x-access-token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git
           python .github/update_readme.py
-          git add README.md
+          git add README.md doc/dressing.txt
           # Only commit and push if we have changes
           git diff --quiet && git diff --staged --quiet || (git commit -m "${COMMIT_MSG}"; git push origin HEAD:${GITHUB_REF})