fix: reduce docs artifact size

Author: gadomski

.github/workflows/docs.yml

@@ -27,7 +27,7 @@ jobs:
           GIT_COMMITTER_NAME: ci-bot
           GIT_COMMITTER_EMAIL: [email protected]
       - name: Checkout gh-pages
-        run: git restore . && git checkout gh-pages
+        run: cargo clean && git restore . && git checkout gh-pages
       - uses: actions/upload-pages-artifact@v3
         id: deployment
         with: