More gallery updates (#418)

* More gallery updates

* Add PublishContent icon

* Address feedback

src/Shared/Telemetry/TelemetryConstants.ts

@@ -109,6 +109,7 @@ export enum Action {
   NotebooksGalleryViewPublicGallery,
   NotebooksGalleryViewFavorites,
   NotebooksGalleryViewPublishedNotebooks,
+  NotebooksGalleryClickPublishToGallery,
 }
 
 export const ActionModifiers = {
@@ -151,3 +152,8 @@ export enum SourceBlade {
   ScriptExplorer,
   Keys,
 }
+
+export enum Source {
+  ResourceTreeMenu = "ResourceTreeMenu",
+  CommandBarMenu = "CommandBarMenu",
+}