add sub routes to page header and remove styled components

[Jadessu]

Describe your changes

Describe the purpose + content of these changes
add sub routes to page header and remove styled components

Link the related issue

Closes #0000

Checklist before requesting a review

• Is this PR ready for merge? (Please convert to a draft PR otherwise)
• I have performed a self-review of my code.
• Did I request feedback from a team member prior to the merge?
• Does my code following the style guide at docs/CODING-STYLE.md?

Instructions for Reviewers

Functionalities or workflows that should specifically be tested.

Environmental conditions that may result in expected but differential behavior.

If relevant, list additional work to complete pre-merge (delete logging, code abstraction, etc)

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