Initial work to publish mdbook docs

Signed-off-by: Michael Telatynski <[email protected]>

.github/workflows/docs.yml

@@ -0,0 +1,30 @@
+name: Deploy documentation
+
+on:
+    push:
+        branches: [develop]
+    workflow_dispatch: {}
+
+jobs:
+    docs:
+        name: GitHub Pages
+        runs-on: ubuntu-latest
+        steps:
+            - name: Fetch element-web
+              uses: actions/checkout@v4
+              with:
+                  path: element-web
+
+            - name: Setup mdBook
+              uses: peaceiris/actions-mdbook@v1
+              with:
+                  mdbook-version: "0.4.10"
+
+            - run: mdbook build
+              working-directory: element-web
+
+            - name: Deploy to gh pages
+              uses: peaceiris/actions-gh-pages@373f7f263a76c20808c831209c920827a82a2847 # v3.9.3
+              with:
+                  github_token: ${{ secrets.GITHUB_TOKEN }}
+                  publish_dir: ./book

docs/SUMMARY.md

@@ -1,5 +1,7 @@
 # Summary
 
+-   [Introduction](../README.md)
+
 # Usage
 
 -   [Betas](betas.md)