Don't put the extension in a subfolder

[SuperSandro2000]

I simply want to clone this extensions to my FreshRSS instance and be able to easily update it later. I can't clone it into the extensions directory cause you put it in a subdir. Can you fix that and just all files in the root of the project?

[kevinpapst]

Code migrated to https://github.com/FreshRSS/Extensions