Improvements for sample-app

[maribethb]

Category

• Examples

Component

sample-app

Describe the solution you'd like

• [X] Add TypeScript templates & enable typescript flag in dev-create
• [ ] Show sample app on blockly-samples site
• [x] Add production webpack build (#1576)
• [x] Add instructions for deployment (#1576)
• [ ] Add tests and test command

Additional context