Add workflow to check for example links and broken links

.github/workflows/docs.yml

@@ -0,0 +1,23 @@
+name: Docs
+
+on:
+  push:
+    tags-ignore:
+      - '**'
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  links:
+    name: Links
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Run Lychee
+        uses: lycheeverse/lychee-action@v1
+        with:
+          args: "--verbose --no-progress './**/*.md' './**/*.html' './**/*.rst'"
+          output: ${{ runner.temp }}/lychee/out.md
+          fail: true

.lycheeignore

@@ -0,0 +1,7 @@
+^https://[^/]+\.example/
+\S+@domain\.example$
+^https://example\.page\.link/
+^https://[^/]+\.firebaseio\.com/
+^https://www\.googleapis\.com/
+^https://oauth2\.googleapis\.com/
+^project-id-xyz@beste-firebase\.iam\.gserviceaccount\.com$