refactor(navbar): eliminate redundant theme-switching script to resol…

[Elchedli]

Type of change

• Bug fix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

• I have read the CONTRIBUTING document.
• I have checked to ensure that this Pull Request is not for personal changes.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

Changes

This PR eliminates an old JavaScript code in src/components/Navbar.astro that manually handled theme toggling. This is because the said logic is already contained in LightDarkSwitch.svelte, hence rendering the Astro script obsolete. Removing this code may prevent future event collissions, reduces the JavaScript payload, and ensures a single source of truth for the site's color scheme state.

How To Test

• Verification by switching the dark/light theme switch.

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