Change homepage setting in package.json to the official docs site

[BioPhoton]

Documentation Related To Component:

The package.json file.

Please check those that apply

• typo
• documentation doesn't exist
• documentation needs clarification
• error(s) in example
• needs example

Description Of The Issue

The package.json file contains a homepage property that points to the github docs. IMO this should point to https://rxjs.dev

[cartant]

Closed by #5669