Switch notebook editors to monaco (#239)

* Upgrade nteract packages and related dependencies to make new stateful-component work

* Switch to new monacoEditor

* Configure store using nteract mythic configuration

* Replace CodeMirror with Monaco editor in NotebookReadOnlyRenderer

* Reformat

* Upgrade d3 to latest to resolve d3-selection conflicts with nteract/data-explorer that broke D3ForceGraph

* Upgrade jupyterlab terminal widget to work with latest version of react. Upgrade jupyterlab services to include latest fix for websocket auth

* Update jest test snapshots

* Upgrade packages to fix build issues

* Remove comment

* Fix unit tests

* Fix unit test snapshot

* Remove useless @types/node-fetch

src/Explorer/Notebook/NotebookComponent/NotebookComponentBootstrapper.tsx

@@ -196,7 +196,6 @@ export class NotebookComponentBootstrapper {
     this.getStore().dispatch(
       actions.createCellBelow({
         cellType: "code",
-        source: "",
         contentRef: this.contentRef
       })
     );