UI enhancements

[dlbnco]

Introduces a few improvements:

• display apollo errors
• add back button on /substance
• create a component for accordion (used on substance header and apollo error)

[vercel[bot]]

This pull request is automatically deployed with Now. To access deployments, click Details below or on the icon next to each push.

Latest deployment for this branch: https://tripbyorg-git-feature-ui-tweaks.dlbnco.now.sh