Transfer repo to TuringLang

[devmotion]

As I wrote in #25 (comment), I think the package shouldn't live in my Github account. Due to its close relation and integration with MCMCChains, I think currently it fits best in TuringLang. However, the plan is to transfer it to arviz-devs in the future if ArviZ starts to use and contribute to MCMCDiagnosticTools, and MCMCChains (and ParetoSmooth) are not the only dependents anymore 🙂

This PR updates the links and deployment of the docs.

@yebai I don't have admin rights anymore, so I can't adjust the link in the description on https://github.com/TuringLang/MCMCDiagnosticTools.jl. Can you fix it?

I'll make a PR to the registry and update the links there when the PR is merged.

[yebai]

@devmotion I fixed your permission.

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[devmotion]

@yebai Thank you!