Refactor templating and drupal 9 support

factory/resources/templates/wisski-site.conf

@@ -0,0 +1,16 @@
+# This file was generated automatically. 
+# It contains configuration for the WissKI site:
+#   ${INSTANCE_DOMAIN}
+# Do not edit unless you know exactly what you are doing.
+
+<VirtualHost *:${PUBLIC_PORT}>
+    DocumentRoot ${WEB_DIR}
+    ServerName ${INSTANCE_DOMAIN}
+    AssignUserId ${SYSTEM_USER} ${SYSTEM_USER}
+
+    <Directory ${WEB_DIR}>
+        include "${WISSKI_COMMON_PATH}/wisski-common-dir.conf"
+    </Directory>
+
+    include "${WISSKI_COMMON_PATH}/wisski-common.conf"
+</VirtualHost>