Navigation: New NavBar designs behind feature toggle (#41045)

* Navigation: Remove plus button behind feature toggle

* Navigation: Add home button behind feature toggle

* Navigation: Move settings/admin to bottom section behind feature toggle

* Navigation: Refactor grafana logo to be a NavBarItem

* Navigation: Create new PluginSection and styling changes to support new sections

* Navigation: Hack to use mobile menu as a mega menu for now

* Navigation: Only render plugin section if there are items

* Navigation: mobile menu is always 100% width if toggle is off

* Navigation: Reset width back to 48 and fix broken css property

* Navigation: Create generic NavBarSection component to reduce repetition

* Navigation: Don't show sublinks for core items

* Navigation: Comments from UX review

* Navigation: Remove mobile menu hack

* Navigation: Unit tests for enrichConfigItems and other minor review comments

* Navigation: Move section logic to backend

* Navigation: Refactor alerting links out into a separate function

* Navigation: More tests for isLinkActive

* Linting...

* Navigation: Create new NavBar component for when feature toggle is enabled

pkg/api/dtos/index.go

@@ -37,21 +37,29 @@ const (
 	// are negative to ensure that the default items are placed above
 	// any items with default weight.
 
-	WeightCreate = (iota - 20) * 100
+	WeightHome = (iota - 20) * 100
+	WeightCreate
 	WeightDashboard
 	WeightExplore
-	WeightProfile
 	WeightAlerting
 	WeightPlugin
 	WeightConfig
 	WeightAdmin
+	WeightProfile
 	WeightHelp
 )
 
+const (
+	NavSectionCore   string = "core"
+	NavSectionPlugin string = "plugin"
+	NavSectionConfig string = "config"
+)
+
 type NavLink struct {
 	Id           string     `json:"id,omitempty"`
 	Text         string     `json:"text,omitempty"`
 	Description  string     `json:"description,omitempty"`
+	Section      string     `json:"section,omitempty"`
 	SubTitle     string     `json:"subTitle,omitempty"`
 	Icon         string     `json:"icon,omitempty"`
 	Img          string     `json:"img,omitempty"`