Concept Index page

[glassjoseph]

The concept index page at /concepts should show a bootstrap-vue datatable with:

• [ ] One column displaying the preferred term in english as a link to the concept page at concepts/{id}.
• [ ] A second column displaying the concept's category

The table should be paginated and searchable by the preferred term.

There should be an "Add New Concept" button to /concepts/create.

See the draft concepts table for reference

[rderik]

Add the following behaviour to the Concepts list:

• [ ] Columns sorting