1. quick-contact.service.ts: Initialize display to true (assume it is not intersecting, otherwise in pages without this section, it can't be initialized correctly).
2. home.component.ts: Removed field "showQuickContact" | In constructor set quickContactService.setDisplay(false) | Refactor intersectionObserver.
3. app-routing.module.ts: In "contact-us" route, set data: {hasQuickContact: false}.
4. app.component.ts: Updated checks for <quick-contact> | Added public showQuickContact: boolean; to be initialized by layoutService.hasQuickContact.