Set xonsh icon on docker hub

[anki-code]

Hi @gforsyth!

1. Please set xonsh icon on dockerhub and update description (icon below).
2. Please replace Python-powered, cross-platform, Unix-gazing shell to Xonsh is a Python-powered shell. Full-featured and cross-platform. in the Docker Hub container description.
3. Remove Wiki and Projects for this repo in Settings
4. Please replace this repo description: "xonsh on docker" to "Xonsh shell container."
5. Please add "podman" and "container" tags to this repo about.

We have:

We want to have:

[gforsyth]

I updated the logo for the xonsh/xonsh repo, but the only way to update an org logo appears to be via gravatar email

[gforsyth]

Also, now you and the rest of xore should have admin on this repo, so you can change descriptions / tags as you see fit