New Logo for Thymeleaf

[daheile]

Very low priority, no issue at all, but it would be nice to have a sprite/logo for Thymeleaf.

Logo can be found here
https://www.thymeleaf.org/download.html#artwork

[Potherca]

I have made a request in the upstream library where a lot of the logos come from: gilbarbara/logos#510

[Potherca]

The waiting is now for a response from the Tymeleaf team: thymeleaf/thymeleaf.github.io#41

[daheile]

Thanks!