UX prototype alerts

[aaronhans]

Parent User Story: https://github.com/cagov/UX/issues/36

Prototype Link(s): https://cagov.github.io/UX/alerts/

• [x] Wireframes implemented
• [ ] HTML page(s) created and linked in UX repo
• [ ] Meta description added
• [ ] Page title updated
• [ ] Automated accessibility checks performed (score of 100%)
• [ ] Manual accessibility checks performed (See checklist)

[aaronhans]

• [x] build new API that resolves county from zip code
• [x] update alert search logic to hit new api when numbers are entered
• [x] fix error message alignment

[abquirarte]

closing, update original as needed. Thanks!