Make svelte 5 documentation and playground better

[J4gQBqqR]

I am confused by the svelte example here. It uses function/constructor and getter/setter to make things work. This example is kind of comparing store vs state rune and looks very unintuitive. The Gotcha Section at the bottom also tricks me to think that I have to use new keywaord with class function constructor plus getter function to make rune acting like store.

I am proposing a dedicated page of documentation explaining how rune can replace store and a few other examples demonstrating how to do it. What do you think?

Also, I want to propse that the svelte 5 playground to enable user to create *.svelte.ts and *.svelte.js file. Currently, the playground only allows creation of *.svelte file when clicking the + button. What do you think?

[brunnerh]

The documentation will be overhauled for the final release anyway.

You can already create .svelte.js files, you have to overwrite the extension via a . at the end (unintuitively).
TS is not supported, though.