 Bugfixes:
 maxWidth and maxHeight not considered in target file width and height (Thanks to Markus Mächler)
 Images from fallback storage can not be processed (Thanks to Markus Mächler)
 Preview images for non-public storages not working (Thanks to Markus Mächler)
 GIFBUILDER not working with deferred image processing (Thanks to Tyrone Rogers for reporting)

 Documentation
 Add section about rewrite rules in .htaccess (Thanks to Manuel Munz)

 Technical stuff
 Add automatic TER publishing through GitHub Actions