Mavka - A new lightweight rust ecosystem for mavlink

[Noah Bliss]

Hey all! Just wanted to make you all aware of mavka (info here: https://mavka.gitlab.io/home/) it's a mavlink library + larger drone ecosystem that seems to better support no-std applications and has some great extensability. Perhaps it would be worth addition to the mavlink.io page under the external section?

Separately, I know the developer, and am sure he would be willing for some official collaboration if there were interest in evaluating it against/in addition to the current mavlink-sdk rust library. 

Curious on y'all's input!

[Hamish Willee]

We'd welcome a PR for addition to the mavlink.io page external section. Ideally from the developers so we have a communication path.