remove unused authentication and add basic authentication example

Author: lurtz

i18n/en/docusaurus-plugin-content-docs/current/reference/configuration/influx.md

@@ -47,7 +47,15 @@ VictoriaMetrix is a time series database with InfluxDB compatible REST API.
 ```yaml
 influx:
   url: http://victoria-metrics:8428
-  database: evcc
-  token: 1234567890abcdef
-  org: home
+```
+
+### With basic authentication
+
+Basic authentication can be done via the URL.
+
+**Example for VictoriaMetrics with basic authentication**:
+
+```yaml
+influx:
+  url: http://username:password@victoria-metrics:8428
 ```