Correct website link for NZBGet

[newzealandpaul]

Description

The JSON link pointed to the website for the original archived project, we install from here:

https://github.com/nzbgetcom/nzbget

Link pointed to official website:

https://nzbget.com/

Fixes #253

Type of change

Please check the relevant option(s):

• Bug fix (non-breaking change that resolves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (a fix or feature that would cause existing functionality to change unexpectedly)
• New script (a fully functional and thoroughly tested script or set of scripts.)

Prerequisites

The following efforts must be made for the PR to be considered. Please check when completed:

• Self-review performed (I have reviewed my code, ensuring it follows established patterns and conventions)
• Testing performed (I have tested my changes, ensuring everything works as expected)
• Documentation updated (I have updated any relevant documentation)