Establish design changes to support L2

[pikonha]

Feature Request

With the L2 implementation coming to its release, some changes will be required on the nameful dapp to support the new interface.

Describe Preferred Solution

The subdomain registration should support:

• setting the subdomain owner (default to the connected wallet)
• setting the domain duration in years

The base implementation of domain registering:

The interface should support both the current database storage and the L2 by adding a new step on the modal:

QA Replication steps

1. go to one of your domains' pages that uses the blockful's L1Resolver
2. create a new subdomain
3. check whether this was created on the given L2

[pikonha]

handoff to the designer made on Sep 16th