Update Jetty release notes to include more images/gifs

[azeey]

Summary

Basically a copy of https://discourse.openrobotics.org/t/gazebo-jetty-released/50349

Preview:

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[kscottz]

We need to replace the logo with the official one. Other than that one optional comment.

[kscottz]

This looks good to me. Let's get it out.