* update: add leftbar to app
* style: a few cosmetic changes
* update: allow pinning workbooks
* style: show ellipsis button only on hover
* update: add basic responsiveness
* style: use active state when file and help menus are open
* style: increase transition time
* update: allow duplication of workbooks
* chore: standardize menus
This splits the webapp in:
* IronCalc (the widget to be published on npmjs)
* The frontend for our "service"
* Adds "dummy code" for the backend using sqlite
