New section in Usage

[andrewwinters5000]

This adds a brief description and links to the JuliaCon talk about how to setup and run Trixi on an adaptive, curvilinear domain. There is also a link for the reproducibility repository.

[ranocha]

Thanks! I like the new section. Would it make sense to also include it in our README.md (which is mostly a copy of this page of the docs)?

[sloede]

Thanks! I like the new section. Would it make sense to also include it in our README.md (which is mostly a copy of this page of the docs)?

Same thoughts here. You could put it after the Usage section and before the Documentation section in the README.md.

[andrewwinters5000]

Would it make sense to also include it in our README.md (which is mostly a copy of this page of the docs)

Done, I put a similar section into the README.md.