Issues pages order/filter by time and count

[doublestranded]

• query count of issues by feed
• on issues index page, filter out feeds without issues (any category of issue).
• consider removing feed select altogether - or consolidate with feeds pages?
• on resolution of feed fetch issue, transition to feed show page
• add issue type back to feed/show page issue (or maybe also feed fetch issue type select in feeds/index page)
• provide the time created on the issue button (or at least the issue-content component)

[doublestranded]

It may be worthwhile to consider adding back the feeds select component to each issue category index page. It is tricky though considering pagination with both the feed select and issues table.