Fix link to LLVM clangd repository (#338)

Author: Ianvdl

index.html

@@ -475,7 +475,7 @@ <h4>Language servers</h4>
             <a href="http://llvm.org/">LLVM Team</a>
           </td>
           <td class="repo">
-            <a href="https://reviews.llvm.org/diffusion/L/browse/clang-tools-extra/trunk/clangd/">clang-tools-extra/trunk/clangd</a>
+            <a href="https://github.com/llvm/llvm-project/tree/main/clang-tools-extra/clangd">clang-tools-extra/trunk/clangd</a>
           </td>
           <td class="success">
             <span class="glyphicon glyphicon-ok" aria-hidden="true"></span>