Add release processes to Developer Docs (#3195)

Co-authored-by: Chris Galvan <chgalvan@amazon.com>

.github/workflows/gh-pages-mdbook.yml

@@ -20,6 +20,8 @@ jobs:
       - name: Install Dependencies
         shell: bash
         run: sudo apt-get install -y libwayland-dev libxkbcommon-dev # Required for winit
+      - name: Install mdbook-alerts
+        run: cargo install mdbook-alerts
       - name: Build
         working-directory: docs/mdbook
         shell: bash