fix user avatar

src/client/html.ml

@@ -208,17 +208,7 @@ module User = struct
         match user.avatar_info with
         | None -> []
         | Some info ->
-          let alt_at =
-            if String.equal "" info.alt then []
-            else [ alt info.alt; name info.name; title info.alt ]
-          in
-          let at =
-            [ Fmt.kstr src "/user/%s/avatar" user.user_id
-            ; class' "img-thumbnail"
-            ]
-            @ alt_at
-          in
-          [ El.img ~at () ]
+          [ Html_util.mk_image ~is_small:true (Avatar (user.user_id, info)) ]
       in
       h1 user.user_nick :: bio :: img