Automate README generation with GitHub Actions

- Add `generate-readme.yml` workflow to update `README.md` on pushes to `main` when `_README.md` changes
- Introduce AWK scripts as a submodule (`scripts/awk`) for processing the README
- Rename `README.md` to `_README.md` to serve as the source file

.github/workflows/generate-readme.yml

@@ -0,0 +1,34 @@
+name: Update README
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '_README.md'
+
+jobs:
+  update-readme:
+    if: ${{ github.actor != 'github-actions[bot]' }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gawk
+
+      - name: Generate README.md
+        run: |
+          awk -f scripts/awk/addGithubShields.awk _README.md | awk -f scripts/awk/makeShieldsSquare.awk > README.md
+
+
+      - name: Commit changes
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: 'Auto-update README.md [skip ci]'
+          file_pattern: README.md
+

.gitmodules

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+[submodule "scripts/awk"]
+	path = scripts/awk
+	url = https://github.com/she3o/AWKward
+	branch = for-awesome-zotero

scripts/awk

@@ -0,0 +1 @@
+Subproject commit 9546dc0876ae7ac402395bdcfdd9dd9f5f521ae1