UX sprint 1 - Admin login & registration

[huongthaoh]

• implement FE changes for admin login
• implement FE changes for admin register
• these FE changes should not affect the backend. make sure API req still works.
• make a PR. include screenshots of what the pages look like now.
• review another person's PR
• get started on the slides for Tuesday. if you have time, could you please review the feedback we got from last presentation and structure our slides accordingly? (i skimmed through it and one of the feedback was we didn't communicate with the client enough-- should def highlight how we've addressed that in this sprint, for example).