Add default placeholder for VSearchBar

[sarayourfriend]

Fixes

Fixes #644 by @zackkrida

Description

Adds a default placeholder text for the search bar.

Testing Instructions

Unit tests should pass. You can also check the search routes for good measure and they should have the placeholder text now. The /404 page should still have it's own custom placeholder text.

Checklist

• My pull request has a descriptive title (not a vague title like Update 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.

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[obulat]

Nice solution!

[zackkrida]

Very clean fix, nice!