Refactor the application structure

[viktor-yakubiv]

The desired structure is:

• elements – @oacore/design with patches
• modules – complex components based on elements
  • at the moment I see depositing, content
• templates – individual user activities we have such as deposit-dates, content, overview and so on, based on modules
• pages – real routes mapped to templates and connected to global application state
• app – global application setup

Three from the top should be state-independent, the last 2 can be dependent on the state (store) and Next.

The pages are dependent on Next anyway. The app could be split to Next-dependent and independent one. However, with Next 9.3 we can have it independent at all.