Add VictoriaMetrix as InfluxDB alternative

The fate of InfuxDB is unclear with many home users not switching to version 3 of InfluxDB. Being stuck at an older version brings with it the danger of unfixed security issues, but there is hope. VictoriaMetrics has among others a REST API, which is compatible with InfluxDB. Thus it can be used as a drop in replacement in evcc.

However Grafana dashboards have to be rebuild, because it does not support any of InfluxDBs query languages and users internally a different data model.

Author: lurtz

docs/reference/configuration/influx.md

@@ -37,3 +37,25 @@ influx:
   token: 1234567890abcdef
   org: home
 ```
+
+## VictoriaMetrics
+
+[VictoriaMetrix](https://github.com/VictoriaMetrics/VictoriaMetrics) ist eine Time Series Datenbank mit InfluxDB kompatibler REST API.
+
+**Beispiel für VictoriaMetrics**:
+
+```yaml
+influx:
+  url: http://victoria-metrics:8428
+```
+
+### Mit basic authentication
+
+Basic authentication ist mit der URL möglich.
+
+**Beispiel für VictoriaMetrics mit basic authentication**:
+
+```yaml
+influx:
+  url: http://username:password@victoria-metrics:8428
+```

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

@@ -37,3 +37,25 @@ influx:
   token: 1234567890abcdef
   org: home
 ```
+
+## VictoriaMetrics
+
+[VictoriaMetrix](https://github.com/VictoriaMetrics/VictoriaMetrics) is a time series database with InfluxDB compatible REST API.
+
+**Example for VictoriaMetrics**:
+
+```yaml
+influx:
+  url: http://victoria-metrics:8428
+```
+
+### 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
+```