[RFC]: build vs watch

[alexmerlin]

RFC

The current build and preview commands are ambiguous.

Currently, we have:

• preview command executes php -S 0.0.0.0:8080 -t public - looks like a workaround for starting the server via npm instead of PHP
• build command executes vite build --watch - builds the assets and rebuilds them on CSS/JS changes

We should have:

• watch command executes vite build --watch - builds the assets and rebuild them on CSS/JS changes
• build command executes vite build - builds the assets and exits

[arhimede]

fixed in #60