Rename .gothub to .forgejo

.forgejo/workflows/link_check.yml

@@ -0,0 +1,20 @@
+name: Link checker
+on:
+  push:
+    paths:
+      - '**.md'
+  pull_request:
+    paths:
+      - '**.md'
+  schedule:
+    - cron: '0 0 * * *'  # every day at midnight
+
+jobs:
+  markdown-link-check:
+    name: Check links in markdown
+    runs-on: container
+    steps:
+      - uses: actions/checkout@v4
+      - uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          use-verbose-mode: true