Single tag view should look more like other single views

[coffee2code]

The single tag view doesn't currently conform to the look of other similar views. See meta-2463.topic-tag-view-header.png​. See meta-2453.single-forum-view-header.png​ for comparison. Differences include:

1. Lack of breadcrumbs (covered separately in #2453).
2. View title is displayed using different markup, leading to slightly larger font size.
3. The subscribe button appears at the top of the main content section instead of the sidebar.
4. No page navigation widget just above the table (only below).

See meta-2463.proposed-topic-tag-view.png​ for how it should look after all the above items are addressed.

[coffee2code]

Current single tag view

[coffee2code]

Current single forum view (for comparison)

[coffee2code]

Single tag view after proposed changes

[coffee2code]

In 4843:

Support Theme: Make single tag view look more like other single views

• Output title in similar markup and ensure similar font sizing
• Move subscription button to sidebar
• Add pagination widget above listing table

Fixes #2463.

[SergeyBiryukov]

In 5103:

Support Theme: Remove bb_base_before_topics_loop() and bb_base_after_topics_loop() introduced in [3730].

Move the modifications to content-archive-topic.php template instead.

See #2463.