CLA document link needs update

[kathatherine]

Checklist

• [X] I added a descriptive title
• [X] I searched open reports and couldn't find a duplicate

What happened?

The CLA document link on https://docs.conda.io/en/latest/contributing.html#conda-contributor-license-agreement needs to be updated so that the doc is hosted by NumFOCUS's Adobe account and not Anaconda's.

Additional Context

No response

[baustinceltic]

@jezdez any word from numfocus on this?

[jezdez]

@baustinceltic Not as such, I'll make it top priority for me now.

[jezdez]

@baustinceltic FYI I've created an epic for this, as it requires a few more steps: https://github.com/conda/cla/issues/1