Include "recipes" in vignette

[seandavi]

• [X] histogram of base counts (in 0f6ff0bd)
• [X] filter samples by bioproject (in 0f6ff0bd)
• [X] filter samples by region (in 0f6ff0bd)
• [ ] summarize counts to "level"
• [ ] filter samples by bug presence

Add additional use cases below.

[vincerubinetti]

Recipes were also added to the website here. Ping me if/when you add more, or feel free to edit that file yourself.