Web export

Serve files of HTML5 export

Outdated. Now you need to serve with special headers from the server

Python 3:

python -m http.server

HTML5 on iOS

1. Export type: Regular. Because threads don't work in WASM ([github issue about it](https://github.com/godotengine/godot/issues/86090), [many other tickets lead to this but I don't see a resolution](https://github.com/godotengine/godot/issues/26554), or one [can return](https://github.com/godotengine/godot/issues/26554) [asmjs back](https://github.com/godotengine/godot/pull/31383) using [this patch](https://patch-diff.githubusercontent.com/raw/godotengine/godot/pull/31383.patch)