add discord link; new thumbnail variant

README.md

@@ -3,6 +3,7 @@
 [![Docker Hub](https://img.shields.io/docker/pulls/hrfee/jfa-go?label=docker)](https://hub.docker.com/r/hrfee/jfa-go)
 [![Translation status](https://weblate.jfa-go.com/widgets/jfa-go/-/svg-badge.svg)](https://weblate.jfa-go.com/engage/jfa-go/)
 [![Docs/Wiki](https://img.shields.io/static/v1?label=documentation&message=jfa-go.com&color=informational)](https://wiki.jfa-go.com)
+[![Discord](https://img.shields.io/discord/922842034170122321?color=%235865F2&label=discord)](https://discord.com/invite/MrtvuQmyhP)
 
 ##### Downloads:
 ##### [docker](#docker) | [debian/ubuntu](#debian) | [arch (aur)](#aur) | [other platforms](#other-platforms)