add link checker to CI (#94)

* add link checker to CI

* fix broken link

Author: glennj

.github/workflows/links.yml

@@ -0,0 +1,23 @@
+name: Links
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  repository_dispatch:
+  workflow_dispatch:
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@8646ba30535128ac92d33dfc9133794bfdd9b411
+        with:
+          args: --cache --accept 200,429 --verbose --require-https --user-agent "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.36" --no-progress **/*.md **/*.html **/*.toml **/*.json
+          fail: true
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

docs/LEARNING.md

@@ -6,5 +6,5 @@ This is a great starting point if you're new to both MoonScript and Lua, explain
 The primary spot for Learning Resources is [the MoonScript website][learn].
 It assumes you are already familiar with Lua.
 
-[leafo]: https://leafo.net/posts/An_overview_of_MoonScript.html
+[leafo]: https://leafo.net/posts/moonscript_overview.html
 [learn]: https://moonscript.org/#learning