[feature] Make theme images redirect to their github repository

[apoleon33]

I think everything said is in the title,

Right now this page serves more as a display to existing themes, but you cannot interact with them.

It would be better to be able to simply click on the theme we like, and be redirected to their respective github repo IMO.

I might work on it if i find time to do that. Might as well fix #39 while Im at it.

[lolocomotive]

Good Idea

[lolocomotive]

Regarding #39 you'd also have to edit the Github action that builds the binaries for all the themes automatically. (https://github.com/lolocomotive/Upsilon/blob/upsilon-beta/build/prebuild.bash)