[ERM-9] Align visual identity with the rest of EToolbox projects

[smiakchilo]

Currently, the Exadel EToolbox suite offers a separate sections in the AEM's "Welcome screen" left rail. Also, it aims to display icons of all the featured solutions in unified manner (see: EToolbox Lists, BackPack).

Need to: redesign the RolloutManager icon to fit in the same icon set, and accomodate it in the "Welcome Screen" section.
Additional concerns: The "preparation for AEMaaCS" audit tool reports an issue with the way the "Welcome screen" section is organized. Need to investigate a more compliant way in line with other popular tool suites for AEM.