Fix img for https://docs.phillycommunitywireless.org/en/latest/mesh-overview/

[eugenethreat]

https://docs.phillycommunitywireless.org/en/latest/mesh-overview/ - relative paths are broken since this is in the root? Not sure. Image displays locally and on deploy previews, but once base path changes in prod to /en/latest it breaks.

https://stackoverflow.com/questions/71074662/configuring-image-filepaths-correctly-in-mkdocs

Working branch - https://github.com/phillycommunitywireless/docs/tree/colobo-img-fix