Create Harvest Source and Organization table pages in Flask app

[btylerburton]

User Story

In order to visualize the list of harvest sources and organizations in the database, datagovteam wants to create two new list pages to display harvest sources and organizations in a table format.

Acceptance Criteria

[ACs should be clearly demoable/verifiable whenever possible. Try specifying them using BDD.]

• GIVEN a user visits a list page
  THEN they will see the list of harvest sources/orgs displayed with their accompanying data in a table format with a series of action buttons for each item

• GIVEN I'm viewing a table of harvest sources
  THEN the buttons will be EDIT, HARVEST, and DELETE

• GIVEN I'm viewing a table of organizations
  THEN the buttons will be EDIT and DELETE

• GIVEN the user clicks EDIT
  THEN they will be brought to the harvest source/organization edit page

• GIVEN the user clicks HARVEST
  AND a job with that harvest_source_id is not currently processing, or in the queue
  THEN this will trigger a new harvest job on that source

• GIVEN the user clicks DELETE
  AND they have confirmed their action
  THEN the harvest source/organization will be deleted

Background

WIP prototype up on remote at https://github.com/GSA/datagov-harvesting-logic/tree/add-source-org-list-pages

Security Considerations (required)

[Any security concerns that might be implicated in the change. "None" is OK, just be explicit here!]

Sketch

• Create new routes for harvest_source and org list pages
• Make a new template to contain a tabular list
• Populate that template with harvest source or organization data
• Add appropriate contextual buttons
• Remove other unnecessary pages from