Road trip pages topbar

[Denijar]

User Story As a user, I want to always see a top bar that applies to the roadtrip I am in when I open a roadtrip.

Acceptance Criteria

• A TopBar component (perhaps we have two - HomeTopBar and RoadTripTopBar) that shows on all road trip pages
• For now - the top bar shows the name of the roadtrip we are in and has dummy add user and user profile icons (as per design)
• A modal that pops up when the add user button is clicked to allow the option to add attendees to the roadtrip
• Modal also shows the list of attendees (use dummy data for now)

Additional Context