Update repository URLs

[steff456]

This PR is part of https://github.com/conda-incubator/conda-store-ui/issues/254

This PR,

• [x] Changes url that where pointing to Quansight org and replace it with conda-incubator org.
• [x] Adds a section for the Code of Conduct in the README.

[steff456]

The only link that is broken for this PR is the documentation preview, https://github.com/conda-incubator/conda-store-ui/blob/30138bf608f35bbd61e77e322f9e23572afe1be5/README.md?plain=1#L14

I'm not sure if the link is going to be https://conda-incubator.github.io/conda-store-ui/?

[pavithraes]

I'm not sure if the link is going to be https://conda-incubator.github.io/conda-store-ui/?

@steff456 Yes, that's the correct link for now. :)

[anirrudh]

Merging this, thank you all!