Fix backend API address

static/config.js

@@ -0,0 +1,2 @@
+config = 'prod'
+// config = 'dev'

static/index.html

@@ -12,6 +12,7 @@
         <!-- Compiled and minified JavaScript -->
         <script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
 
+        <script src="config.js"></script>
         <script src="zetikettes.js"></script>
 
         <style>

static/zetikettes.js

@@ -1,4 +1,7 @@
-const backend_api = '/zetikettes/srv/';
+const backend_api = {
+    'prod': '/zetikettes/srv/',
+    'dev': '/zetikettes.dev/srv/',
+}[config];
 
 const zetikettes = [
     {