Docs: v2.0.0 update (#138)

Removes IPv6 known issue.
Removes environment variables.
Adds configuration section.

Closes #130

Author: marefr

README.md

@@ -17,10 +17,6 @@ However, [Chromium browser](https://www.chromium.org/) depends on certain librar
 system you may encounter errors when trying to render an image. For further details and troubleshooting help, please refer to
 [Grafana Image Rendering documentation](https://grafana.com/docs/administration/image_rendering/).
 
-### Known issue having IPv6 disabled
-
-We've got reports regarding the plugin doesn't work if IPv6 is disabled. The current workaround is to use [Remote Rendering Using Docker](#remote-rendering-using-docker) instead. Refer to [issue](https://github.com/grafana/grafana-image-renderer/issues/48) for more information.
-
 ## Installation
 
 ### Using grafana-cli
@@ -38,44 +34,10 @@ for rendering and using remote rendering, see [Remote Rendering Using Docker](#r
 
 If you still want to install the plugin in the Grafana docker image we provide instructions for how to build a custom Grafana image, see [Grafana Docker documentation](https://grafana.com/docs/installation/docker/#custom-image-with-grafana-image-renderer-plugin-pre-installed) for further instructions.
 
-### Environment variables
-
-You can override certain settings by using environment variables and making sure that those are available for the Grafana process.
-
-**Default timezone:**
-
-Instruct headless browser instance to use a default timezone when not provided by Grafana, e.g. when rendering panel image of alert. See [ICU’s metaZones.txt](https://cs.chromium.org/chromium/src/third_party/icu/source/data/misc/metaZones.txt?rcl=faee8bc70570192d82d2978a71e2a615788597d1) for a list of supported timezone IDs. Fallbacks to `TZ` environment variable if not set.
-
-```bash
-GF_RENDERER_PLUGIN_TZ=Europe/Stockholm
-```
-
-**Ignore HTTPS errors:**
-
-Instruct headless browser instance whether to ignore HTTPS errors during navigation. Per default HTTPS errors is not ignored.
-Due to the security risk it's not recommended to ignore HTTPS errors.
-
-```bash
-GF_RENDERER_PLUGIN_IGNORE_HTTPS_ERRORS=true
-```
-
-**gRPC port:**
-
-Change the listening port of the gRPC server. Default is `0` and will automatically assign a port not in use.
-
-```bash
-GF_RENDERER_PLUGIN_GRPC_PORT=50059
-```
-
-**Verbose logging:**
-
-Instruct headless browser instance whether to capture and log verbose information when rendering an image. Default is `false` and will only capture and log error messages. When enabled, `true`, debug messages are captured and logged as well.
 
-For the verbose information to be included in the Grafana server log you have to adjust the rendering log level to `debug`, see [Troubleshoot image rendering](https://grafana.com/docs/grafana/latest/administration/image_rendering/#troubleshoot-image-rendering) for instructions.
+### Configuration
 
-```bash
-GF_RENDERER_PLUGIN_VERBOSE_LOGGING=true
-```
+For available configuration settings, please refer to [Grafana Image Rendering documentation](https://grafana.com/docs/administration/image_rendering/).
 
 ## Remote Rendering Using Docker
 
@@ -85,10 +47,6 @@ Instead of installing and running the image renderer as a plugin, you can run it
 
 For troubleshooting help, please refer to [Grafana Image Rendering documentation](https://grafana.com/docs/administration/image_rendering/#troubleshooting).
 
-## Building from source
-
-See [Building from source](https://github.com/grafana/grafana-image-renderer/blob/master/docs/building_from_source.md).
-
 ## Additional information
 
 See [docs](https://github.com/grafana/grafana-image-renderer/blob/master/docs/index.md).