Remove NotebookTab (#35)

src/Explorer/Tabs/TabComponents.ts

@@ -1,7 +1,6 @@
 import DocumentsTabTemplate from "./DocumentsTab.html";
 import ConflictsTabTemplate from "./ConflictsTab.html";
 import GraphTabTemplate from "./GraphTab.html";
-import NotebookTabTemplate from "./NotebookTab.html";
 import SparkMasterTabTemplate from "./SparkMasterTab.html";
 import NotebookV2TabTemplate from "./NotebookV2Tab.html";
 import TerminalTabTemplate from "./TerminalTab.html";
@@ -51,15 +50,6 @@ export class GraphTab {
   }
 }
 
-export class NotebookTab {
-  constructor() {
-    return {
-      viewModel: TabComponent,
-      template: NotebookTabTemplate
-    };
-  }
-}
-
 export class SparkMasterTab {
   constructor() {
     return {