chore: use xtask for building mdbok (#312)

Author: makspll

.github/workflows/mdbook.yml

@@ -36,10 +36,10 @@ jobs:
       uses: Swatinem/rust-cache@v2.7.3
 
     - name: Install mdBook
-      run: cargo install mdbook
+      run: cargo xtask init --dont-update-ide
 
     - name: Build the book
-      run: cd docs && mdbook build
+      run: cargo xtask docs --no-rust-docs
 
     - name: Deploy to GitHub Pages
       if: github.ref == 'refs/heads/main' || github.ref == 'refs/heads/staging'