remove weealloc suggestion or add warning about OOM in wasm section

[TomPridham]

it seems like weealloc doesn't work terribly well with bevy. it grows memory at a fairly quick pace and will cause an OOM with just the basic program below.
i'm also not the only person to encounter issues with it: rustwasm/wee_alloc#105
would you be open to a pr removing it from the wasm section or just adding a disclaimer saying that it is potentially broken?

#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;

#[wasm_bindgen]
pub fn run() {
    App::new()
        .add_plugins(DefaultPlugins)
        .run();
}

[inodentry]

OOF. OK, I will remove it.