Joplin in-app navigation: update menu items based on user roles

Original design issue: https://github.com/cityofaustin/techstack/issues/4418

# The ask
As we're preparing for our first round of users, let's start to account for the differences in views depending on user role, starting with the `global nav`.

# Files
Abstract collection: [🤝 App shell per user role ∙ Dev handoff ](https://share.goabstract.com/b7b674e3-4613-4274-856f-5030faf404c8)

# Acceptance criteria
- [ ] Menu items reflect permission levels below

**Admin**
- [ ] pages
- [ ] contacts
- [ ] users
- [ ] departments
- [ ] images
- [ ] documents

**Publisher**
- [ ] pages
- [ ] users
- [ ] images
- [ ] documents

**Author**
- [ ] pages
- [ ] images
- [ ] documents