Convert header-related components to script setup (23)

[obulat]

Fixes

Related to #4678 by @obulat

Description

This PR converts the header-related components to script setup. This is the basis for the work on combining the mobile and desktop headers.

Changes

• remove defineComponent
• convert props to withDefaults and defineProps
• convert emits to defineEmits
• remove returns

Testing Instructions

The CI should pass, and the headers should work as usual.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

Developer Certificate of Origin

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[zackkrida]

There are some terminal warnings for this PR:

 WARN  [Vue warn]: Missing required prop: "navLinkClasses"
 WARN  [Vue warn]: Missing required prop: "variant"
 WARN  [Vue warn]: Missing required prop: "isInModal"

I think it relates to how

[obulat]

There are some terminal warnings for this PR:

The optional props were declared as non-optional in VPageLinks.
Fixed in fda0987

[zackkrida]