Vue 3: Identify and remove filters

[MatthewGidcomb]

One of the big breaking changes in Vue 3 is the removal of the "filters" feature (details). We mainly used this for formatting dates, using a filter provided by the vue-moment plugin.

Alternatives:

• Use a computed property to process data for display; this has the benefit of caching the results and should theoretically improve render times (although in practice it's probably not noticeable)
• Per the docs, it's possible to sort of re-implement it manually using globalProperties, but the usage syntax wouldn't quite be the same.

Marking this as a potential good-first-issue because it should be pretty straightforward to identify and address all of these. I'll try to do a pass later and flag any that may need further thought.

[MatthewGidcomb]

Not as many of these as I thought there were. Quick pass turned up:

• AdminEventsList (dateFormat and ownerLogo)
• EventCard (truncate - can we refactor this to use a CSS-based approach instead?)