* Add VictoriaMetrics to remote storage integrations

Mention that VictoriaMetrics supports direct PromQL querying.
Signed-off-by: Aliaksandr Valialkin <valyala@gmail.com>

* Removed the confusing part about remote read support for VictoriaMetrics

VictoriaMetrics doesn't support remote read API, so remove that part
Signed-off-by: Aliaksandr Valialkin <valyala@gmail.com>