feat(annuaire): Add user registry page and search feature

src/app/app.module.ts

src/app/header/header.component.html

src/app/login/login.component.scss

src/app/models/user.model.ts

src/app/services/auth.service.ts

src/app/structure-list/services/search.service.ts

src/assets/ico/annuaire-unlogged.svg

src/assets/ico/sprite.svg

src/assets/scss/_color.scss

src/styles.scss