feat: Add dark mode theme and dynamic title styling

[yashpadaliya08]

🛠️ Issue (Number)

Closes # [Insert Issue Number Here]

Description

Added a fully functional Dark Mode feature to improve user experience, accessibility, and visual comfort.

• Theme Toggle: Added a sun/moon toggle switch (<button>) to the main navigation bar.
• Dark Mode Styling: Implemented rich .dark-mode CSS classes targeting cards, backgrounds, and text while preserving the original deep blue theme color in the navbar/footer to organically complement the layout and logo.
• Theme Alignment fix: Refactored the duplicate overlapping header texts (PROJECTS and Projects) to use Flexbox and absolute positioning instead of brittle negative margins. This fundamentally prevents the text misalignment bug currently present on differing screen resolutions.
• Theme Persistence: Added local storage save/load functionality in script.js so user theme preferences persist across reloads.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have made this from my own
• I have taken help from some online resourses
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• The title of my pull request is a short description of the requested changes.

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