Update flavour screenshots for Noble release

[aaronprisk]

Done

• Added screenshot images to asset manager
• Updated img src for each respective flavour

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes
• [List additional steps to QA the new features or prove the bug has been resolved]

Issue / Card

As part of: https://warthogs.atlassian.net/browse/DESPM-1969

Help

QA steps - Commit guidelines