Update screenshots in documentation to match latest designs

https://docs.datasette.io/en/0.62/full_text_search.html has this out-of-date screenshot:

<img width="1191" alt="image" src="https://user-images.githubusercontent.com/9599/195911747-386f4cd2-5239-4c83-8e0c-072e6ae56ff6.png">
