docs: add the documentation site as homepage in package.json

[giladgd]

Description of change

Add the documentation site as homepage in package.json.
This way the npm module page will also link to the documentation site, instead of displaying 2 links to the same github page.

Pull-Request Checklist

• Code is up-to-date with the master branch
• npm run format to apply prettier formatting - N/A
• npm run test passes with this change - N/A
• This pull request links relevant issues as Fixes #0000 - N/A
• There are new or updated unit tests validating the change - N/A
• Documentation has been updated to reflect this change - N/A
• The new commits follow conventions explained in CONTRIBUTING.md

[pleerock]

Thanks!