CSS navbar and color tweaks (#13609)

* CSS and color tweaks

- Unify navbar-style menus
- Fix admin bar overlapping menu bar
- Fixes file edit comment box
- Fix double border on review box
- Fix review timeline icons

* Many fixes to new-menu and navbar layout enhancements

* misc settings fixes

* navbar tweak

* fix pr tabs

* branch tag and arc color tweaks

web_src/less/_dashboard.less

@@ -1,6 +1,4 @@
 .dashboard {
-  padding-top: 15px;
-
   &.feeds,
   &.issues {
     .context.user.menu {
@@ -71,7 +69,9 @@
 
   .dashboard-navbar {
     width: 100vw;
-    padding: 0 .5rem;
+    padding-left: .5rem;
+    padding-right: .5rem;
+    padding-top: 15px;
     .org-visibility .label {
       margin-left: 5px;
     }