Add a "featured projects"/"showcase" section

### Motivation

There are a lot of cool open-source projects developed with ROHD. It would be interesting to others to see what people have done and fun for people who have made something to show it off!

### Desired solution

Add a dedicated section where people can upload write-ups and links to their projects that leverage ROHD

### Alternatives considered

Just post on the blog instead?

### Additional details

Thanks to @RossComputerGuy for the suggestion (on Discord
https://discord.com/channels/1001179329411166267/1001179329411166270/1451712075545051336)!