Highlight institutions that use Dask

On the [Dask landing page](https://dask.org/) we have a "Powered by Dask" section which lists several free and open source projects that use or integrate with Dask. This does a good job of highlighting the open source Dask ecosystem and how Dask interoperates nicely with the rest of the PyData stack.

Additionally there's also value in highlighting companies or other institutions which _use_ Dask (e.g. in a product they make, to scale internal processes, etc.). If someone comes to dask.org and sees that Dask is used at, for example, Captial One/NVIDIA/Microsoft/..., they'll get the (correct) sense that Dask is production-ready and trusted by large organizations. For an example of how another open source project has done this, see the "Currently in use at" section of https://jupyter.org/.

This issue is to gauge if there's interest / buy-in from Dask community members to add a section to dask.org where we feature companies that use Dask. This could take the form of a grid of logos, a carousel of quotes from companies about how they use Dask (I think we collected some of these at the Dask workshop last February?), or something else -- totally open to suggestions.