"Get Involved" section on the homepage lacks correct typographical size differentiation and rhythm

## Description
The "Get Involved" section has mismatched spacing and sizing rhythms for the content present within.

## Reproduction

1. Visit homepage
2. Scroll down
3. See error.

## Expectation
The typography should match and build from the `program-index` context's "card" list, since it borrows heavily form its design.
* https://vocabulary-docs.netlify.app/specimen/contexts/program-index

## Screenshots

## Resolution

- [ ] I would be interested in resolving this bug.

Start at the homepage's "Get Involved" section and compare its typography, spacing, and sizing with the "card" list in the linked program-index context. Done means the section has matching typographical size differentiation and spacing rhythm.

Written by the indexing model from the issue text.