ux(help): began work on new help modal

public/app/partials/help_modal.html

@@ -2,9 +2,17 @@
 	<div class="modal-header">
 		<h2 class="modal-header-title">
 			<i class="fa fa-keyboard-o"></i>
-			<span class="p-l-1">Keyboard shortcuts</span>
+			<span class="p-l-1">Help</span>
 		</h2>
 
+		<ul class="gf-tabs">
+			<li class="gf-tabs-item" ng-repeat="tab in ['Shortcuts', 'Tips', 'Docs']">
+				<a class="gf-tabs-link" ng-click="editor.index = $index" ng-class="{active: editor.index === $index}">
+					{{::tab}}
+				</a>
+			</li>
+		</ul>
+
 		<a class="modal-header-close" ng-click="dismiss();">
 			<i class="fa fa-remove"></i>
 		</a>