create android upgrade prompt

[Thenlie]

This PR creates a banner to indicate to Android users that they can install a native app.

• The "here" text links to the play store.
• The "X" button will dismiss the banner and prevent it from showing again, unless local storage is cleared.
• This will only ever show on android web devices based on userAgent.

Pretty bare-bones right now. Happy to add more to this if needed.

Apologies for the terrible screenshot XD

[switz]

is this synchronous and okay to use in the render function? if so, just pass !androidUpgradeNotificationDismissed into the useState default and you can drop the useEffect below :)

[switz]

this may break because of SSR. if so you can make this component imported dynamically so it only renders on the client

import dynamic from 'next/dynamic'
 
const DynamicHeader = dynamic(() => import('../components/header'), {
  ssr: false,
})