Set collection from URL

[raphaeltraviss]

Before this PR: you could drop a link to your ENS, and people come into the app looking at your wallet overview

After this PR: you can link direct to a particular collection you want to show off:

• As the owner, I click on a collection, and the URL is updated with the collection name
• As a viewer, I click the URL, and my browser opens eth.af with my wallet pre-populated, and it automatically loads that particular collection

NOTE: I'd recommend we go with URL routes like my-wallet/collection/some-collection-address:

• prepend "collection" in case we have other things we want to use the URL for in the future
• use the collection address instead of the contract name, since it could have weird characters
• --> let me know if you think this is a good idea
• right now it just jams the contract name in the URL and that's it

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