VOTE-2741: split feature card styles from all card styles

[mlloydbixal]

Jira ticket

VOTE-2741

Description

Splits the card styles that just apply to the feature cards from the rest of the styles that the nvrf also inherits from.

Deployment and testing

QA/Testing instructions

1. lando retune
2. visit landing page
3. test feature cards on all screen sizes, confirm no changes
4. visit http://vote-gov.lndo.site/register/washington/mail-in-form-filler
5. navigate to the second page
6. confirm the cards inherit the same styles *the mobile cards should stack and not change visually

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.