Support type triggers (#96)

* implement mirrorlist package generator

* implement keyring package generator

* docs update

* do not skip empty lines

* fill remote source for local packages

* faq update

docs/ahriman.core.rst

@@ -19,6 +19,7 @@ Subpackages
    ahriman.core.repository
    ahriman.core.sign
    ahriman.core.status
+   ahriman.core.support
    ahriman.core.triggers
    ahriman.core.upload