Asset breakdown in portfolio page

[JonRay15]

Story

As a user I want to see the breakdown of my assets and how they're used in portolfio screen So that I know where my assets are allocated

Acceptance Criteria

• [ ] There is a view on portfolio page per asset giving the split by account
• [ ] There are quick action buttons to open the deposit / withdrawal page for that asset
• [ ] We are using the new asset icons from the store - speak to @edd

Sketch

A quick MVP might be to lean on the existing asset view ... but we will need some sort of card for the sidebar eventually so maybe just bit the bullet now.

Additional details / background info