add lychee gh actions to check for dead links

.github/workflows/links-pr.yml

@@ -0,0 +1,17 @@
+name: Dead Links (Fail Fast)
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@v1.9.0
+        with:
+          fail: true
+          args: --base . --verbose --no-progress 'README.md'

.github/workflows/links.yml

@@ -0,0 +1,26 @@
+name: Dead Links (Cron)
+
+on:
+  repository_dispatch:
+  workflow_dispatch:
+  schedule:
+    - cron: "00 18 * * *"
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Link Checker
+        id: lychee
+        uses: lycheeverse/lychee-action@v1.9.0
+        args: --base . --verbose --no-progress 'README.md'
+
+      - name: Create Issue From File
+        if: env.lychee_exit_code != 0
+        uses: peter-evans/create-issue-from-file@v4
+        with:
+          title: Link Checker Report
+          content-filepath: ./lychee/README.report.md
+          labels: report, automated issue