Add three new jobs

[crd477]

Description

Add three new jobs that came in recently:

• Cleveland Clinic Director of Research Computing (Google Form response 538)
• Georgia Tech Research Scientist (Google Form response 539)
• Eagle Rock Analytics Full-Stack Geospatial Developer (Google Form response 540)

Checklist:

• [x] I have previewed changes locally or with CircleCI (runs when PR is created)
• [x] 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.

When you are ready for a technical review/merge, post the for the link for the PR in the US-RSE Slack (#website) to ask for reviewers.

[mrmundt]

glsen.org has been having issues for a few days. It looks like their security cert expired.

[crd477]

Preview here.