Dropdowns, Labels fixes and more CSS tweaks (#13733)

* Dropdowns and Labels fixes

- Rework dropdown, menu and label styles
- Improve issue sidebar milestone and label sections
- Fix archived repo and private org badge
- Move more colors to CSS vars
- Move issue number to end of title on issue page

* more dropdown fixes

* fix basic blue labels - fixes #13731

* improve class setting on svg

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

web_src/less/_organization.less

@@ -173,45 +173,4 @@
       height: 60px;
     }
   }
-
-  &.settings {
-    .labelspage {
-      list-style: none;
-      padding-top: 0;
-
-      .item {
-        margin-top: 0;
-        margin-right: -14px;
-        margin-left: -14px !important;
-        padding: 10px;
-        border-bottom: 1px solid var(--color-secondary);
-        border-top: none;
-
-        a {
-          font-size: 15px;
-          padding-top: 5px;
-          padding-right: 10px;
-          color: #666666;
-
-          &:hover {
-            color: #000000;
-          }
-
-          &.open-issues {
-            margin-right: 30px;
-          }
-        }
-
-        .ui.label {
-          font-size: 1em;
-        }
-      }
-
-      .item:last-child {
-        border-bottom: none;
-        padding-bottom: 0;
-      }
-
-    }
-  }
 }