Ui for sbt-server

### Sub tasks

- Stream api ✔
- layout and widgets ✔
    - plugin layout
    - header
    - navigation and status shortcuts
    - panels
- home
- adapt tutorials
- build/compile
- code/editor
- run/inspect
    - full logs
    - actors
    - requests
    - deviations
- test
- monitor

Each bullet point should be a PR
Yeah. We don't care anymore. Here is Activator's html nowadays:
https://github.com/typesafehub/activator/blob/797629897e97c611ea40800cde9f750e46254d38/ui/app/views/main.scala.html#L31