Spike Store Improvements, Part 1

[brandoningli]

Related bugs/feature requests

• Part of solution to #37

Describe the changes

• Make store items more centrally defined
• Add new items for Spike launch, but disabled

Expected behavior

Screenshots

New npm dependencies

Testing Instructions

• [ ] Give yourself Spike Bucks
• [ ] Remove role(s)
• [ ] Buy them and make sure they apply
• [ ] Make sure error handling works

Additional context

This PR is safe to merge now. There will be a second PR after this is approved that should not be merged until we are ready to enable the Spike launch items.

Do not delete this branch with this PR.