Restructure code base

[jessemao]

It's not quite clear as now what are the components we are trying to publish as a part of our framework, because we group all of them together under src folder. So I'd suggest we rework on the code structure to make all our components more clear with the following structure:

• playground
  • server
  • client
    • src
      • App
      • assets
        ...
• components
  • Login
  • Register
  • settings

In development, we start our server from playground and import packages from components so that it's more clear on what packages we are publishing.