Retain host parameter

[stevesweets]

Hoping I haven't done unintended here. I'm sure someone will tell me if I have.

Removed host parameter from filter. AppBridge 2 requires this parameter to be set in initialisation, so having it on the url is very useful.

I bumped to 2.0.3 for this:

package.json

"dependencies": {
    "@shopify/app-bridge": "^2.0.3",
    "@shopify/app-bridge-react": "^2.0.3",
    "@shopify/app-bridge-utils": "^2.0.3"
...

As the host parameter is now available on the url, it could be placed on the blade template for my SPA

<input type="hidden" id="host" value="{{ \Request::get('host') }}" />

And included by my top js.

...
const config = {
    host: document.getElementById("host").value,
    ...
}