Let's move the External Task Client JS into an npm organization.

Acceptance Criteria (Required on creation):

• We have an camunda platform npm organisation
• Developers are added as maintainers
• Thorben has owner privileges, other team members are regular members (principle of least privilege)
• The camunda-platform account is removed from the organization
• The release instructions for the external task client is updated
• The confluence page with the NPM credentials is removed

Hints (optional):

https://docs.npmjs.com/converting-your-user-account-to-an-organization