Replace the inline gaufre.js/nginx.conf ConfigMap approach with a
purpose-built custom image (sunbeam/integration-service) that builds
the lagaufre.js v2 widget from the suitenumerique/integration source
and serves it via nginx.
Changes:
- Rewrite integration-deployment.yaml: custom image, v2 services.json
format, only actually-deployed services (docs, meet, people)
- Add people-frontend nginx sub_filter overlay to rewrite the hardcoded
production integration URL baked into the Next.js bundle at build time
- Register integration image in local overlay kustomization