Portals : Installation guide and technical documentation

• https://crossmedia.atlassian.net/wiki/spaces/WD/pages/3298787349

• https://crossmedia.atlassian.net/wiki/spaces/WD/pages/3299180556

For a more functional presentation, please refer to the following documentation:

• https://crossmedia.atlassian.net/wiki/spaces/WD/pages/3244490755