Fix link to surround documentation in index.html (#51)

templates/index.html

@@ -51,7 +51,7 @@ <h2>Built in Rust, for the terminal</h2>
             <h2>Modern builtin features</h2>
             Fuzzy finder to jump to files and symbols, project wide search,
             <a href="https://github.com/helix-editor/helix/wiki/Themes">beautiful themes</a>,
-            auto closing bracket pairs, <a href="https://docs.helix-editor.com/usage.html#surround">
+            auto closing bracket pairs, <a href="https://docs.helix-editor.com/surround.html">
             surround</a> integration and more.
           </div>
         </div>