Replace Jekyll inline styles

[beechnut]

Jekyll allows you to do inline styles, but 11ty doesn't. Find them by searching for {: in .md files.

All of them seem to be related to styling images or their captions. Instead of using inline styles, let's replace them with

Fortunately, there are only 7 of these across the site.

Acceptance criteria

Beta Give feedback

1. There are no instances of Jekyll-style inline styles {: across the site
2. The blog posts that use to have them render about the same

[sam-couch-18f]

This change has been merged into the replatform-main branch. Closing!