Update flatpak install instructions (official!)

Author: FoxxMD

README.md

@@ -31,7 +31,7 @@ A javascript app to scrobble music you listened to, to [Maloja](https://github.c
 * Web server interface for stats, basic control, and detailed logs
 * Smart handling of credentials (persistent, authorization through app)
 * Easy configuration through ENVs or JSON
-* Docker images for x86/ARM
+* Install using [Docker images for x86/ARM](/docs/installation.md#docker), [flatpak](/docs/installation.md#flatpak), or [locally with NodeJS](/docs/installation.md#nodejs)
 
 **Why should I use this over a browser extension and/or mobile app scrobbler?**
 

docs/installation.md

@@ -35,8 +35,6 @@ SPOTIFY_CLIENT_ID=yourId SPOTIFY_CLIENT_SECRET=yourSecret MALOJA_URL="http://dom
 
 ## Flatpak
 
-**(Coming soon!)**
-
 You must have [Flatpak](https://flatpak.org/) installed on your system.
 
 ```shell