Use podlove subscribe button

[funkenstrahlen]

https://github.com/podlove/podlove-subscribe-button

[Dennis-Kluge]

Is the subscribe button already released? I couldn't find the built directory in the repo. Furthermore we should check how paths for images etc. are handled.

[funkenstrahlen]

I do not know the exact state of the project. A better overview can be found here http://podlove.org/podlove-subscribe-button/