zls in the browser

Works pretty well in a bunch of browsers, but note the required security headers.

Installing

Compile zls for wasm32-wasi and place zls.wasm in src
Additionally, place zig.tar.gz (make sure that the name matches) from the website in src
- If you've downloaded Zig and built from source following ZIG_WASM.md, you can also use this command:
```
tar -C /path/to/zig -cz lib/std >src/zig.tar.gz
```

npm install
npm run serve

Enjoy!