Update preface.rst

[ProductRyan]

Add a description of your changes with links to any relevant material.

• updating basic info and links

Date Needed (optional)

• N/A

If the release date of a feature is known or estimated, provide it to give reviewers guidance on turnaround time.

Reviewers

• @sarina

Possible roles follow. The PR submitter checks the boxes after each reviewer finishes and gives :+1:.

• [ ] Subject matter expert:
• [ ] Subject matter expert:
• [ ] Doc team review (sanity check, copy edit, or dev edit?): @edx/doc
• [ ] Product review:
• [ ] Partner support:
• [ ] PM review:

FYI: Tag anyone else who might be interested in this PR here.

Testing

• [ ] Ran ./run_tests.sh without warnings or errors

HTML Version (optional)

• [ ] Build an RTD draft for your branch and add a link here

Sandbox (optional)

• [ ] Point to or build a sandbox for the software change and add a link here

Post-review

• [ ] Add a comment with the description of this change or link this PR to the next release notes task.
• [ ] Squash commits

[sarina]

Hey @ProductRyan - do you have time/capacity to address the changes?

[feanil]

@ProductRyan checking back in, do you have time to address the change request?