Homepage news update for the testathon

[bram-atmire]

Description

Reference to the testathon on the homepage
Reference to the test accounts on the homepage

Instructions for Reviewers

Look at the homepage

Checklist

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• My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
• My PR passes TSLint validation using yarn run lint
• My PR doesn't introduce circular dependencies
• My PR includes TypeDoc comments for all new (or modified) public methods and classes. It also includes TypeDoc for large or complex private methods.
• My PR passes all specs/tests and includes new/updated specs or tests based on the Code Testing Guide.

[tdonohue]

@bram-atmire : Just a quick note. I like the changes overall, though this will be dependent on @artlowel's simple default "dspace" theme in #1063. So, we'll likely have to wait on that...or bring this idea into that PR (as I think these Testathon-specific homepage news changes should move into the "dspace" default theme anyways).

[tdonohue]

@bram-atmire : I didn't forget about this change! However, I had to rework it slightly in a new PR (#1098) as the changes to the homepage need to be moved into the new "dspace" theme. So, I'm closing this PR in favor of that one. Thanks!

[bram-atmire]

Awesome, thank you Tim !!!