Shiba v2

Shiba v2 will be a complate rewrite of v1 and will drop several features to keep the application simple.

The next implementation will:

• drop the built-in linter feature since checking the source directly in text editor is more useful
• drop the HTML preview feature since it is actually not used
• be a single executable using native WebView instead of Electron since it makes the installation much easier and the application size much smaller
• use Rust for the main logic and use TypeScript with React for the view logic since Rust is faster and safer