Feature/vote 2085/high contrast register to vote

[SamiraMSadat]

Jira ticket

VOTE-2085

Description

Implement high contrast styles to the Register to vote component.

Deployment and testing

Post-deploy steps

1. lando retune
2. cd into theme - npm run build

QA/Testing instructions

1. Sign in as admin
2. Navigate to http://vote-gov.lndo.site/register
3. Toggle the high contrast button, verify all the high-contrast styling matches the design
4. Toggle back to default, verify none of the high contrast styles are being applied

Checklist for the Developer

• A link to the JIRA ticket has been included above.
• No merge conflicts exist with the target branch.
• Automated tests have passed on this PR.
• A reviewer has been designated.
• Deployment and testing steps have been documented above, if applicable.

Checklist for the Peer Reviewers

• The file changes are relevant to the task objective.
• Code is readable and includes appropriate commenting.
• Code standards and best practices are followed.
• QA/Test steps were successfully completed, if applicable.
• Applicable logs are free of errors.