Interests input on new announcement page is not accessible

[WilHall]

The interests input on the new announcement page uses Selectize.js, and it is not friendly to screen readers for several reasons:

• The input does not have a label
• The placeholder is uninformative
• Selectize.js is not very accessible:
  • When values are selected, the input reads as empty
  • Options are very difficult to navigate with a screen reader