Created deck editor

[eviterin]

Context

Some initial version of a deck editor, tightly coupled with the collection view.
Deck Creator #40

Describe Your Changes

Deck editor page added.
Index page updated with a link to decks.
Collection display now features a list of the player's decks (part of #93)

Checklist

• [X ] I have performed a self-review of my code
• [X ] I ran make check and fixed resulting issues
• I ran the relevant tests and they all pass
• I wrote tests for my new features, or added regression tests for the bug I fixed

[norswap]

Previous PR: #96

Merging this as we discussed.

@eviterin could you add issues for merging collection & editor, and then for connecting the editor to the chain?