chore: migrate npm registry from CodeArtifact to JFrog

[davidacevedo]

Summary

Migrates this repo's npm registry configuration from AWS CodeArtifact to JFrog Artifactory as part of the org-wide rollout.

Changes:

• Registry config files (.yarnrc.yml / .npmrc): URL → JFrog, token → JFROG_ACCESS_TOKEN
• CircleCI: replaces CodeArtifact commands with public-packages/setup orb step
• GitHub Actions: replaces appfolio/generate-codeartifact-token with appfolio/public-packages/setup@v1
• Dockerfiles: secret mount IDs and env vars updated
• Docs: updates CodeArtifact references to JFrog

No action needed on your end — just review and merge. If CI is red or you have questions, ping #frontend-platform.

Local setup

Run otto login --install-jfrog-token to get a local JFROG_ACCESS_TOKEN (lasts 1 year).