Adding Elestio as fully managed option

[kaiwalyakoparkar]

Hey there,
I am Kaiwalya, Developer Advocate at Elestio. Elestio has been providing options of fully deploying and managing Rallly application as shown here. I think it would be a great idea if we can add it to official readme/documentation here.
✨ In addition to this, similar to other tools in the documentation we also share revenue with the open source projects we facilitate. If this collaboration opportunity interests you, just shoot me an email at [email protected] :)