feat(deertopia): Foundational Authelia setup

By 'foundational,' I mean that a demo is working correctly.  Work will
continue in a follow-up commit integrating existing services with LDAP
and Authelia. ♥

hosts/deertopia/configuration.nix

@@ -92,12 +92,13 @@
     };
 
     deertopia = {
-      slskd.enable = true;
-      jellyfin.enable = true;
-      nginx.enable = true;
-      webdav.enable = true;
+      authelia.enable = true;
       bepasty.enable = true;
+      jellyfin.enable = true;
       lldap.enable = true;
+      nginx.enable = true;
+      slskd.enable = true;
+      webdav.enable = true;
 
       # A simple default webpage.  This should probably live somewhere else.
       nginx.vhosts."www" = {