Switch to nzbgetcom GitHub repository

## Summary
The original GitHub repository, nzbget-ng/nzbget is no longer maintained and is archived. This PR switches to the new [nzbgetcom/nzbget](https://www.reddit.com/r/usenet/comments/18yx5a3/nzbgetngnzbget_will_be_merging_into/) repository which is actively being maintained.

## Changes
* Switch to actively maintained nzbget repository
* Bump to latest nzbget version (22.0)
* README updates

Dockerfile

@@ -1,5 +1,5 @@
 FROM binhex/arch-int-vpn:latest
-ENV NZBGET_VERSION=21.1
+ENV NZBGET_VERSION=22.0
 # additional files
 ##################
 

README.md

@@ -11,7 +11,7 @@ This Docker includes OpenVPN and WireGuard to ensure a secure and private connec
 
 **Build notes**
 
-Latest stable NZBGet release from Arch Linux repo (v21.0)
+Latest stable NZBGet release from Arch Linux repo (v22.0)
 Latest stable Privoxy release from Arch Linux repo.  
 Latest stable OpenVPN release from Arch Linux repo.  
 Latest stable WireGuard release from Arch Linux repo.

build/root/install.sh

@@ -49,7 +49,7 @@ source aur.sh
 
 # install nzbget
 
-wget -O /tmp/nzbget.run https://github.com/nzbget/nzbget/releases/download/v$NZBGET_VERSION/nzbget-$NZBGET_VERSION-bin-linux.run
+wget -O /tmp/nzbget.run https://github.com/nzbgetcom/nzbget/releases/download/v$NZBGET_VERSION/nzbget-$NZBGET_VERSION-bin-linux.run
 sh /tmp/nzbget.run --destdir /usr/sbin/nzbget_bin
 ln -s /usr/sbin/nzbget_bin/nzbget /usr/sbin/nzbget