ci(links): added link checking to docs

.github/workflows/linkcheck.yaml

@@ -0,0 +1,21 @@
+name: Linkcheck
+on: [push]
+jobs:
+  linkcheck:
+    name: Linkcheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18.x
+
+      - name: npm install, build
+        run: |
+          cd docs
+          npm install
+          npm run build:ci
+
+      - uses: untitaker/hyperlink@0.1.26
+        with:
+          args: docs/_site/