TopNav: Section navigation UX (#55012)

* Design tweaks

* Updated

* Fixing unit tests

* Review fixes

* Text primary on active sections, and change home icon to text

* spacing fix

* More fix

* Fixes

* Updates

pkg/api/index.go

@@ -328,7 +328,8 @@ func (hs *HTTPServer) getNavTree(c *models.ReqContext, hasEditPerm bool, prefs *
 		// Move server admin into Configuration and rename to administration
 		if configNode != nil && serverAdminNode != nil {
 			configNode.Text = "Administration"
-			serverAdminNode.Url = "/admin"
+			serverAdminNode.Url = "/admin/server"
+			serverAdminNode.HideFromTabs = false
 			configNode.Children = append(configNode.Children, serverAdminNode)
 			adminNodeIndex := len(navTree) - 1
 			navTree = navTree[:adminNodeIndex]