BSv5.2 upgrade followup

[chalin]

This is a followup meta issue to #470.

• [x] #1525
  • [x] #1482
  • [x] #1483
    • [x] #1547
• [x] #1531
• [x] #1631
• [x] Ensure that the swagger-ui shortcode still works and that rendered pages are properly formatted. Might be good to address the following at the same time: #1076
• [x] #1267
• [x] #1369
• [x] #1385
• [x] #1460
• [x] #1844
• [ ] #1436
• [x] #1442

Other un-triaged post-upgrade checks and suggested changes:

• Table style override still necessary? For details, see https://github.com/google/docsy/pull/1255#issuecomment-1311967942
• #1387
• #1391
• #1423

Related:

• #1528
  • #1563

[chalin]

FYI, BSv5.3 is now officially out! https://github.com/twbs/bootstrap/releases/tag/v5.3.0