Feature/dark mode toggle #38
                
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This pull request adds a Dark Mode toggle button to the Good_First_Issue_Web_App, allowing users to switch between light and dark themes for a better user experience, especially in low-light environments.
Changes Made:
Added a toggle button in the header/nav component (Layout.js)
Implemented dark mode styles in CSS (Layout.css)
Used localStorage to persist user theme preference across sessions
Toggle works across all routed pages (Hero, About, Repositories, Form)
Testing:
Verified theme switches correctly when clicking the toggle
Theme preference persists after refreshing the page
Works consistently on all pages within the app
Notes:
Smooth transitions added for better user experience
No impact on app performance or layout