[MNT] Reworked routing for the app

[rmanaem]

Closes #545

Changes proposed in this pull request:

• Implemented navigateToPage action
• Replaced the implicit routing using to prop on buttons with a call to navigateToPage action on click event
• Updated my_happy_annotation_page e2e test

Checklist

• PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF], [MODEL], [DOC]) (see https://neurobagel.org/contributing/pull_requests for more info)
• PR links to GitHub issue with mention Closes #XXXX
• Tests pass
• Checks pass

For new features:

• Tests have been added

For bug fixes:

• There is at least one test that would fail under the original bug conditions.

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[surchs]

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