* 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
* Added support for taking screenshot
- Screenshot is taken using html2canvas package
- Converted to base 64 and uploaded to metadata
- For Using first display output
- Notebok object is passed instead of string, to publish pane
- The first cell with output present is parsed out
- The dom is also parsed to get corresponding div element to take screenshot of the first output
* fixed bug
* Addressed PR comments
- FIxed bug that didn't capture screenshot when mutiple notebook tabs are opened
* removed unnecessary dependencies
* fixed compile issues
* more edits
* Initial commit
* Address PR comments
* Move notebook related stuff to NotebookManager and dynamically load it
* Add New gallery callout and other UI tweaks
* Update test snapshot
