Add page for DMV-RSE affinity group

[KristijanArmeni]

Description

This PR adds a page for the DMV-RSE regional affinity group. The group is active and already has a Slack channel (#rg-dmv-rse) and a Google group, but we wanted to add a page to have all information in one space and to keep track record.

The page follows the affinity group template and has been reviewed by the fellow group coordinator Jennifer Melot.

Checklist:

• I have previewed changes locally or with CircleCI (runs when PR is created)
• I have completed any content reviews, such as getting input from relevant working groups. If no, please note this and wait to post the PR to the #website channel until the content has been settled.

[mrmundt]

Suggestion: "who considers themselves a research software engineer or ally" - unless you do want to specifically restrict to RSEs?

[KristijanArmeni]

Thanks @mrmundt ! Yeah, that sounds good -- I added it in.

[KristijanArmeni]

Looks like it's failing with URL checking here:

🤔 Uh oh... The following urls did not pass:
/github/workspace/_data/rse-groups.yml:
     ❌️ https://ssa.ncsa.illinois.edu/

Can't see if that's something due to changes in this PR specifically.

[danielskatz]

That URL is fine, but this is now failing on https://dan.mccloy.info/ which is also failing for me locally.