Filtering by Region and Sector should be done by WP Query

[jhung]

Is your feature request related to a problem? Please describe.

Currently viewing Stories by Region and Sector is handled by displaying an index for the pcc-region and pcc-sector taxonomies. These taxonomies should be invisible to the site visitor and the view by Region / Sector should be handled by a WP query.

Describe the solution you'd like

Add Sector and Region parameters to the Organization filter, and handle the sector and region GET requests in the Page.storiesQuery() controller function.

This way, filtering content is all handled by a single form on the interface and a single WP query in the controller.

Design consideration

Adding Sector and Region options to the filters may not fit well in the current horizontal orientation. May have to consider using a filter list design (see: https://pinecone.netlify.app/components/detail/filter-list.html).