Add artistic content to left column

[iandunn]

The content here isn't essential for the launch, and isn't straightforward to implement w/ the current state of FSE.

• Releases category: version number the post is about, like described in Implement design for Releases category #38
• Events category: year of post. The year is simple with <!-- wp:post-date {"level":2,"className":"event-year","format":"Y"} /-->, but it needs to be grouped according to year, which isn't simple. Implement Events category design, posts grouped by year #281
• All categories without a specific template: The first letter of the category name, with other letters hidden. This could be done in CSS with color and :first-letter, but that's hacky. Dynamic templates would probably be best. A custom block would also work, but that isn't a sustainable approach for all the other instances where we need dynamic templates.
• The 2-column layout styles may need to be adjusted to account for all of the above

[ryelle]

Do we need this separate tracking issue? Releases & the initial letters are done, and Events is tracked in #281.

[iandunn]

Doesn't seem like it, now that those issues exist 👍🏻