fixing workflow

Author: pvetere

.github/workflows/gh-pages.yml

@@ -22,7 +22,7 @@ jobs:
         run: |
           curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf -y | sh
           rustup update
-          cargo install --version ${MDBOOK_VERSION} mdbook mdbook-linkcheck
+          cargo install mdbook mdbook-linkcheck
 
       - name: Setup Pages
         id: pages
@@ -31,10 +31,6 @@ jobs:
       - name: Build with mdBook
         run: mdbook build docs
 
-      - run: cargo install mdbook-linkcheck
-
-      - run: mdbook build docs
-
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with: