Sort results

[dwhieb]

• [x] https://adrianroselli.com/2021/04/sortable-table-columns.html
• [x] https://inclusive-components.design/data-tables/ (See section on sortable tables)
• [x] https://www.moesif.com/blog/technical/api-design/REST-API-Design-Filtering-Sorting-and-Pagination/
• [x] https://learn.microsoft.com/en-us/azure/architecture/best-practices/api-design

Backend

• [x] Add a sort parameter whose value is a comma-separated list of field names preceded by a +/- to indicate ascending/descending.

Frontend

• [x] aria-sort
  • [x] Place on the <th>.
  • [x] Values: ascending | descending | none (default) | other
  • [x] Don't use none; just remove the attribute.
  • [x] Only one column should have the sort at a time.
• [x] Add sort icons (unsorted, ascending, descending).
  • [x] These should be contained within buttons, and the actual icon is aria-hidden.
  • [x] Add aria-describedby, pointing to the (hidden) <caption>.
  • [x] Change color on hover.
  • [x] Support dark mode.
• [x] Add JS functionality to adjust querystring and submit search to server.
  • [x] Third click on column removes it from the sort directives.
  • [x] The sort priority needs to be retained during parsing/serialization of the sort directives.
• [x] Indicate sort priority.
  • [x] data-priority on <th> to indicate sort priority.
  • [x] Hidden span within the <th> showing the sort priority.
  • [x] Sort priority badges on/near/above <th>.