Improve Theme (#279)

* Add a functional demo web server and documentation page

Create a Node.js HTTP server to serve the Galio Framework demo page, including HTML structure, CSS styling, and server logic.


* Add theme support for light, dark, and auto modes

Introduce theme provider with support for 'light', 'dark', and 'auto' modes, utilizing `useColorScheme` hook for system preference detection. Implements `deepMerge` for theme customization and adds `useThemeColors` hook.


* Update button component to use new theme color system

Refactors the Button component to consume colors from `useThemeColors` hook instead of directly from `useGalioTheme`, ensuring consistent theme application across the application.
* Update input component to use theme colors dynamically

Refactors the Input component to use `useThemeColors` hook for dynamic color application, improving theme adaptability and removing hardcoded color values.

Author: baseley

.gitignore

@@ -3,3 +3,4 @@ node_modules/**/*
 npm-debug.*
 yarn.lock
 .DS_Store
+*.log