Related Posts: capture ideas from Project Thread

From the Project Thread.

```
Sample Improvement Ideas:

- Ability to choose Font settings (like font family) for individual elements, like titles, dates, and excerpts.
- Updating the settings labels to resemble the ones found in the Latest post blocks. (e.g., Changing “Display thumbnails” to “Display feature images.”)
- Setting for showing the author’s name.
- Settings for showing post content.
- Settings for image alignment.
- Settings for adding a link to the featured image.
- Adding sorting.
- Adding filtering (e.g. by category, by author).
- Ability to add a heading like “Related articles.”
```

- [x] Add ideas to project board.
- [x] Annotate as needed (for anything we're unclear on).
- [x] Update issues with difficulty, size, and priority fields as needed.
- [x] Ping Red Team for board review.