drop npm release steps from releasing docs

[apetro]

The npm release is a distraction. The way the uportal-app-framework is in practice adopted by downstream applications is via overlay on its Maven artifacts. So keep the Maven release steps, drop the npm step, one less thing to do when releasing.

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Review for security considerations

• The change has been examined for security impact.

PR considerations checklist:

• N/A Updates CHANGELOG.md to reflect this PR's change.
• This Contribution is under the terms of Individual Contributor License Agreements (and also Corporate Contributor License Agreements to the extent applicable) appearing in the Apereo CLA roster.