Merge branch '36-fix-api-documentation-link' into '1.3'

Resolve "Fix API documentation link"

See merge request fusiondirectory/dev-manual!57

source/api/api.rst

@@ -3,4 +3,4 @@ FusionDirectory API
 
 FusionDirectory API is called simplePlugin and is documented automatically at each build.
 
-`FusionDirectory API <http://api.fusiondirectory.org/index.html>`_
+`FusionDirectory API <https://api.fusiondirectory.org/index.html>`_