Build the manual using mdbook and redirect old page

.github/workflows/ci.yml

@@ -3,6 +3,9 @@ on:
   push:
     branches:
       - src
+  schedule:
+    # Every hour, to pick up the latest rust-analyzer repo changes.
+    - cron: '0 * * * *'
 
 jobs:
   CI:
@@ -16,6 +19,31 @@ jobs:
 
       - run: bundle install && bundle exec jekyll build
 
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: [email protected]
+
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: [email protected]
+
+      - name: Clone the latest rust-analyzer, as of the mdbook PR
+        uses: GuillaumeFalourd/[email protected]
+        with:
+          depth: 1
+          branch: 'mdbook-yolo'
+          owner: 'joshrotenberg'
+          repository: 'rust-analyzer'
+
+      - name: Build generated.md files
+        run: cd rust-analyzer && cargo xtask codegen diagnostics-docs && cargo xtask codegen assists-doc-tests && cargo xtask codegen feature-docs
+
+      - name: Run mdbook
+        run: cd rust-analyzer/docs/book && mdbook build && cp -r book _site
+
+      - name: Include mdbook output
+        run: cp -r rust-analyzer/docs/book/book _site
+
       - name: Deploy
         uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
         with: