ci: refactor generate-docs workflow to use external source

Updated the workflow to use an external generate-docs workflow from the BlueLua repository.

Author: haithium

.github/workflows/generate-docs.yml

@@ -14,31 +14,4 @@ jobs:
     permissions:
       contents: write
       pull-requests: write
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-
-      - name: Checkout docs generator
-        run: git clone --depth 1 https://github.com/BlueLua/bluelua.github.io.git "${RUNNER_TEMP}/docgen"
-
-      - name: Setup Lua
-        uses: leafo/gh-actions-lua@v13
-        with:
-          luaVersion: "luajit"
-
-      - name: Generate docs
-        run: luajit "${RUNNER_TEMP}/docgen/scripts/generate-api-docs.lua" types docs
-
-      - name: Format docs
-        run: npx --yes prettier@3.8.3 --write "docs/**/*.md"
-
-      - name: Open docs PR
-        uses: peter-evans/create-pull-request@v7
-        with:
-          commit-message: "docs: generate API docs"
-          title: "docs: generate API docs"
-          body: "Generate and format API docs from LuaLS type annotations."
-          branch: automation/generate-docs
-          add-paths: |
-            docs
+    uses: BlueLua/bluelua.github.io/.github/workflows/generate-docs.yml@main