Repair past posts

[matt-dray]

• Amend categories and tags, see #27
• Add details expansion block if needed, see #30 and see here for some code
• Spellcheck, see #16
• Correct the images and alt tags, see here if there's a caption
• Remove author name, see #26

[matt-dray]

To do:

• [ ] https://www.rostrum.blog/2018/04/27/two-dogs-in-toilet-elderly-lady-involved/
• [ ] https://www.rostrum.blog/2018/06/05/tid-ye-text/
• [x] https://www.rostrum.blog/2018/12/24/nba-travel/

[matt-dray]

All past posts are being revisited for the Quarto port, so this issue is irrelevant.