hedgedoc: Use to_nice_json in config.json template

hedgedoc/templates/config.json.j2

@@ -13,10 +13,10 @@
 {% if hedgedoc_cookiePolicy is defined %}
         "cookiePolicy": "{{ hedgedoc_cookiePolicy }}",
 {% endif %}
-        "db": {{ hedgedoc_db|to_json }}
+        "db": {{ hedgedoc_db|to_nice_json|indent(8, false) }}
 {% if hedgedoc_extra_config is defined -%}
 {% for k, v in hedgedoc_extra_config.items() %}
-        , "{{ k }}": {{ v|to_json }}
+        , "{{ k }}": {{ v|to_nice_json|indent(8, false) }}
 {% endfor %}
 {%- endif %}
     }