fix: less loose permissions, less +x

Closes coop-cloud/organising#283.

pkg/server/server.go

@@ -12,7 +12,7 @@ import (
 func CreateServerDir(serverName string) error {
 	serverPath := path.Join(config.ABRA_DIR, "servers", serverName)
 
-	if err := os.Mkdir(serverPath, 0755); err != nil {
+	if err := os.Mkdir(serverPath, 0644); err != nil {
 		if !os.IsExist(err) {
 			return err
 		}