Update front end accessibility

[theimbender]

This update provides a few tweaks to the front end view that should get the Lighthouse accessibility score to 100:

• Update NPM dependencies
• Include all of Bootstrap instead of just trying to comment out what's not used. Since PurgeCSS was added to the project to remove unused styles in Update front end dependencies, purge unused CSS from bundle #730, we don't have to do that manually and it just makes it harder if you're trying to use parts of Bootstrap that would need to be re-added
• Change how the collapsible sections work, since I had it backwards when I first implemented ARIA. This change puts aria-expanded on the control rather than container element, and adds aria-controls to support the relationship between control and container.
• Use the hidden property to prevent collapsed sections from being tabbed to
• Add a debounced listener to window resize event to update the heights of collapsed sections on window resizes
• Add aria-label attribute to select elements with no associated label
• Update some CSS class names, Bootstrap has classes that specifically add good text color contrast that we should be taking advantage of
• Update the link icon next to each package's title to be the same color as the link text so that it's visible

[alcohol]

Thanks!