fix(ui): cleanup css deadcode related to stackable menus (#11719)

Followup to https://codeberg.org/forgejo/forgejo/pulls/11597#issuecomment-11486785

We only have two stackable menus in the UI:

https://codeberg.org/forgejo/forgejo/src/commit/c1787d06e2917e75eb8901ac0586abb34a54f669/templates/user/dashboard/navbar.tmpl#L2

https://codeberg.org/forgejo/forgejo/src/commit/c1787d06e2917e75eb8901ac0586abb34a54f669/web_src/js/components/DashboardRepoList.vue#L328

None of them have classes `right` or `pointing`. Not normally, not through JS.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11719
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: 0ko <0ko@noreply.codeberg.org>
Co-committed-by: 0ko <0ko@noreply.codeberg.org>

web_src/css/dashboard.css

@@ -50,11 +50,6 @@
   }
 }
 
-.dashboard.feeds .right.stackable.menu > .item.active,
-.dashboard.issues .right.stackable.menu > .item.active {
-  color: var(--color-red);
-}
-
 .dashboard .dashboard-repos,
 .dashboard .dashboard-orgs {
   margin-bottom: 0;

web_src/css/user.css

@@ -69,10 +69,6 @@
   }
 }
 
-.user.profile .ui.secondary.stackable.pointing.menu {
-  flex-wrap: wrap;
-}
-
 .user.link-account:not(.icon) {
   padding-top: 15px;
   padding-bottom: 5px;