feat: updates homepage component spacing and opacity

[dianneweinthal]

• adds button text to section-dual-masonry
• standardizes width of search-home with main text container
• adjusts opacity on masthead-primary

[github-actions[bot]]

🚀 Deployed on https://deploy-preview-284--ucla-library-storybook.netlify.app

[pghorpade]

:tada: This PR is included in version 2.22.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: