Add word-break to sidebar-item-link (#23146) (#23180)

Backport #23146

Fixes https://github.com/go-gitea/gitea/issues/22953

![image](https://user-images.githubusercontent.com/18380374/221351117-1e4b8922-04ca-4717-8e3b-c338a61bc062.png)

Co-authored-by: yp05327 <576951401@qq.com>
Co-authored-by: delvh <leon@kske.dev>

web_src/less/_repository.less

@@ -3250,8 +3250,8 @@ td.blob-excerpt {
 }
 
 .sidebar-item-link {
-  display: inline-flex;
   align-items: center;
+  word-break: break-all;
 }
 
 .diff-file-box[data-folded="true"] .diff-file-body {