Upgrade to Node 19

Summary:
This uses our own Spectacle version compatible with latest Node version,
using Dart Sass implementation.

Fixes T1651.

Test Plan: Build image, use spectacle to rebuild docker-registry-api documentation

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1651

Differential Revision: https://devcentral.nasqueron.org/D2924