Replace duplicate info with doc link. Add screenshots to README

Closes #37 (with doc)

README.md

@@ -4,24 +4,9 @@ Dashboard for Tarantool application and database server monitoring, based on [gr
 
 Our pages on Grafana Official & community built dashboards: [InfluxDB](https://grafana.com/grafana/dashboards/12567), [Prometheus](https://grafana.com/grafana/dashboards/13054).
 
-You can find screenshots and short description of contents on Grafana pages.
+Refer to dashboard [documentation page](https://www.tarantool.io/en/doc/latest/book/monitoring/grafana_dashboard/) for prerequirements and installation guide.
 
-# How to use
-
-Guide on Tarantool project prerequirements and metrics collectors configuration can be found on corresponding Grafana Official & community built dashboards pages: [InfluxDB](https://grafana.com/grafana/dashboards/12567), [Prometheus](https://grafana.com/grafana/dashboards/13054).
-
-# How to import
-
-1. Open Grafana import menu.
-<br/><br/>![Grafana import button in v6.6.0](./docs/grafana_import_v6.png)
-
-1. Select one of the following options:
-    * Paste dashboard id: `12567` for InfluxDB, `13054` for Prometheus;
-    * Paste link to dashboard: https://grafana.com/grafana/dashboards/12567 for InfluxDB, https://grafana.com/grafana/dashboards/13054 for Prometheus;
-    * Upload json file or paste json file contents: download it from Grafana page ([InfluxDB](https://grafana.com/grafana/dashboards/12567), [Prometheus](https://grafana.com/grafana/dashboards/13054)) or build it by yourself.
-
-1. Set dashboard name, folder, uid (if needed), and database-related query parameters (InfluxDB source, measurement and policy or Prometheus source, job and rate() time range).
-<br/><br/>![Grafana import setup in v6.6.0 for InfluxDB](./docs/grafana_import_setup_v6.png)
+<img src="./doc/monitoring/images/Prometheus_dashboard_1.png" width="310"/> <img src="./doc/monitoring/images/Prometheus_dashboard_2.png" width="310"/> <img src="./doc/monitoring/images/Prometheus_dashboard_3.png" width="310"/> 
 
 # How to build