Add link to stages field in .pre-commit-config.yaml

Author: stefmolin

index.html

@@ -1097,7 +1097,13 @@ <h2>Good to know</h2>
             </li>
             <li class="fragment">
               Hooks can be configured to run at different Git stages
-              (<em>e.g.</em>, pre-push).
+              (<em>e.g.</em>, pre-push):
+              <a
+                href="https://pre-commit.com/#config-stages"
+                target="_blank"
+                rel="noopener noreferrer"
+                >pre-commit.com/#config-stages</a
+              >.
             </li>
             <li class="fragment">
               Check out