Add new Knowville AWS organizer images

[arjunrbery]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Image Submissions:

1. Does your submission match the PR you sent to the Directory?

   • Is the image you include correspond to the cluster file you submitted to the Directory?

   e.g. if you submitted a group file, the photo you are submitting here IS the logo for that group?

   Note, any submission that does not adhere to this will be denied a PR. Please keep in mind the Code of Conduct when submtting.

   • Does the name of the file corresponding to the image / logo EXACTLY match the name (but all lowercase) of the cluster submitting to.

   e.g. If there is a space in the name, _ is used in the filename to denote a space.

   Please note file names must be all lowercase.

   • The name of the PR makes explicit what the image being contributed to is.

New Feature Submissions:

1. Does your submission pass tests?
2. Have you lint your code locally prior to submission?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?