Updates to Developer Page and Manage Users

[amanifarooque]

Summary

• Updates to the Developer page to remove references to Instagram
• Adding user account link to managing users page

PR Checklist

• [x] Test Federalist Preview link for your branch for functionality - make sure all links and buttons work, javascript works as intended, and updates display as expected
• [x] Conduct a HemingwayApp review of the content for plain language. Request plain language review in #helpwanted if needed before merging this PR
• [N/A] Conduct a Lighthouse Audit via Chrome Developer Tools. Identify any issues that must be addressed before merging, and fix
• [x] Ensure no non-public information is published in the commit messages

[amanifarooque]

Preview URL here: https://cg-a72b65a7-73f0-4859-a1d7-dc953cf6ade8.app.cloud.gov/preview/gsa/search-gov-website/cms/developer/index/developer/

Not sure why the GH diff is showing more changes, but the main change was to remove the reference to Instagram in ASIS, and update the last_modified date.

[amanifarooque]

Preview URL for Manage Users addition is here: https://cg-a72b65a7-73f0-4859-a1d7-dc953cf6ade8.app.cloud.gov/preview/gsa/search-gov-website/cms/developer/index/admin-center/dashboard/users.html

[amanifarooque]

Support page preview link: https://cg-a72b65a7-73f0-4859-a1d7-dc953cf6ade8.app.cloud.gov/preview/gsa/search-gov-website/cms/developer/index/support.html