Add respective CASA logo to their landing pages

[volatile3]

What type(s) of user does this feature affect?

• non-logged in users

Description
Add the logos of the specific CASAs we're serving to the landing page on the new-theme branch.

• Create a new section on the landing page titled
  "Casa Organizations Powered by Our App"
• Make sure pictures of the logos are under this section
• Every Casa has uploaded their own logos, use those.
• Make sure it doesn't look weird on mobile views

Screenshots of current behavior, if any

https://casa-new-theme.herokuapp.com/

QA Login Details:
Link to QA site

Login Emails:

• volunteer1@example.com view site as a volunteer
• supervisor1@example.com view site as a supervisor
• casa_admin1@example.com view site as an admin

password for all users: 12345678

Questions? Join Slack!

We highly recommend that you join us in slack https://rubyforgood.herokuapp.com/ #casa channel to ask questions quickly and hear about office hours (currently Tuesday 6-8pm Pacific), stakeholder news, and upcoming new issues.

[t-bello7]

I would like to work on this task

[github-actions]

This issue has been open without changes for a long time! What's up?

[github-actions]

This issue has been inactive for 365 hours (15.21 days) and is past the limit of 360 hours (15.00 days) so is being unassigned.You’ve just been unassigned from this ticket due to inactivity – but feel free to pick it back up (or a new one!) in the future! Thank you again for your contribution to this project.