studio: tree shake purescript & javascript, and bundle

[epost]

• [x] bundle the studio using spago bundle-module
• [x] stbx-js inclusion
  • [x] make sure to get rid of the prepare target in package.json, which copies stbx.js as a resource.
• [x] dagre inclusion
• [x] bundle all css and svg in one file
• [x] bundle all js in one file