Support org logos that are PNG files

[sethetter]

Currently if we have an org in the org list, we expect there to be an SVG logo in public/images/logos/ with a name matching the org name in the list.

I can't find an SVG for lake-afton-public-observatory, so adding png support would be cool :)

[Aatmaj-Zephyr]

Can you please assign it to me? I have almost fixed it....

[sethetter]

@Aatmaj-Zephyr sorry! We are running a local hacktoberfest event in our city and are reserving these issues for members of our community.

[Aatmaj-Zephyr]

sure