Code with unicode chars can't be tried in playg

If you click on "Try it..." you encounter an issue if the code has a non ASCII char:

From https://github.com/vlang/docs/blob/main/assets/scripts/v-docs.js#L340-L341

let code = editor.getValue();
let url = "https://play.vlang.io/?base64=" + btoa(code);

btoa can not encode Unicode chars.

The solution would need to be implemented on the vplay end as well to be able to decode the text ( https://developer.mozilla.org/en-US/docs/Web/API/Window/btoa#unicode_strings ):

function base64ToBytes(base64) {
  const binString = atob(base64);
  return Uint8Array.from(binString, (m) => m.codePointAt(0));
}

function bytesToBase64(bytes) {
  const binString = Array.from(bytes, (byte) =>
    String.fromCodePoint(byte),
  ).join("");
  return btoa(binString);
}

// Usage
bytesToBase64(new TextEncoder().encode("a Ā 𐀀 文 🦄")); // "YSDEgCDwkICAIOaWhyDwn6aE"
new TextDecoder().decode(base64ToBytes("YSDEgCDwkICAIOaWhyDwn6aE")); // "a Ā 𐀀 文 🦄"

Start at assets/scripts/v-docs.js lines 340-341 and trace the Try it flow to https://play.vlang.io/. Reproduce the failure with a non-ASCII example, then verify that encoding in the documentation flow and decoding on the vplay end preserve Unicode correctly. Done means Unicode code can be opened and tried without the btoa error.