Add new "Eclipse In Action" article: "The Active Ecosystem of Eclipse Theia Adopters" at eclipse.org/topics/ide/

We would like to add a new "Eclipse In Action" article to eclipse.org, following the same principle as the first one we published here: Issue #831.

The article has been properly reviewed and approved by @jharrisj1m and @croundy , see: Marketing Issue #3312.

• Approved article content: Google Doc
• Pictures and assets (including animated gif): Google Drive folder

Acceptance criteria

• Article is added and published under the "Eclipse In Action" section
• Images and animated gif from the shared folder are included as appropriate
• Layout and styling are consistent with the first article

/cc @cguindon