[theme] Emerald theme for Photon

Saw people on slrpnk.net were looking for a photon theme so I decided to make one. I'm not necessarily expecting this to be used at slrpnk.net, but I like the theme so I'll be using it. It has a nice light theme too.

It's pretty similar to a recent post for a "wintergreen" theme, this one is less saturated.

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