Workshop 1 for new editor

Pivotal chores [70661346](https://www.pivotaltracker.com/story/show/70661346) and [70663582](https://www.pivotaltracker.com/story/show/70663582)
Rearranged workshop 1 to fit within framework of work done to improve the code editor on `ide-reborn` branch.
- Merged and cleaned up various workshop css files
- Updated workshop1 instructions
- Updated workshop1 layout to take advantage of the new, full window preview
- Embedded existing student HTML scaffold in angular.js editable region