Improve navigation of web documentation

[danielnaab]

Extended Description As a user, I would like an intuitive way to discover the structure of the web documentation.

Acceptance Criteria

• [x] Improvements made to the presentation of the documentation navigation

Definition of Done

• [x] Acceptance criteria met
• [ ] Unit test coverage of our code > 90% - needs automation story
• [ ] Accessibility tests pass - needs automation story
• [ ] Automated code quality checks pass
• [ ] Security reviewed and reported - check in with Wes on what we could do here
• [ ] Reviewed against plain language guidelines
• [x] Design QA passed
• [x] Code must be self-documenting
• [x] No local tech debt
• [ ] Documentation updated
• [ ] Architectural Decision Record completed as necessary for significant design choices
• [ ] PR reviewed & approved
• [ ] Source code merged