Complete + updates for EC lo-fi wireframes

[NicoleGovvy]

Complete and update lo-fi wireframes based on feedback from user sessions + staff.

Screens:

• [x] Signing up for an account
• [x] Dashboard
• [x] Account view
• [x] Compliance view
• [x] View all credits
• [x] Pay remittance with credits
• [x] Voluntarily retire credits
• [x] Transfer (own accounts)
• [x] Transfer (external accounts)

Review:

• [ ] Review with business area + updates to prep for usability testing.