* 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
* Added support for custom image upload
- Dropdown gives an option for URL or image upload
- Preview shows how the card will be displayed in the gallery
- base64 converted image stored in metadata document
- Max limit is 1.5MiB for the image
* fixed lint errors
* addressed PR comments
- Added test
* added snapshot
* fixed failing test
* Add hyperlink icon for links in DialogComponent
* Use a Cosmos DB image for sample Persona
* Fix tests
* Update standalone gallery behavior to match DE gallery
* Use /gallery endpoint for gallery
* Update Gallery Card style to remove buttons in standalone mode
* Address comments
* Add text banner
* Added infinite progress bar when gallery notebook content loads
- reused infinite progress bar from magic commands
* made single quotes to double quotes
* formatting changes
* updated state
* changed to ProgressIndicator
* undo packgae.json change
* Remove enableGallery feature flag
* Fix bugs
* Add tests to increase coverage
* Move favorites functionality behind feature.enableGalleryPublish flag
* Show code cells in NotebookViewer
* Use cosmos db logo as persona image for sample notebook gallery cards
* Update gallery card snapshot to fix test
* Add generic component
* Add validation. Rename to widgetRenderer
* Remove test code from splash screen
* Clean up infobox
* Fix styling/layout
* Move test code into unit test
* Replace <input> and <labe> by <TextField> and <Text> respectively. Fix style.
* Replace InfoBoxComponent with UI fabric MessageBar. Fix styling for TextField
* Use MessageBar for error message
* Rename WdigetRendererComponent to SmartUiComponent
