Proxy thumbnails

[eliihen]

As mentioned in the README, thumbnails are not proxied through the graphQL server yet. It would be great if we could get this in order, then the last place a tracking cookie could enter the user's browser would be dealt with.

I imagine an a generic proxy endpoint in express. It could take any URL and simply pipe the result through to the client. This would make it pretty versatile for future use.

Right now the links look like this: https://i.ytimg.com/vi/mHDcjKlT8d8/hqdefault.jpg.
An example of what it could look like is: https://libretube.you.com/proxy/i.ytimg.com/vi/mHDcjKlT8d8/hqdefault.jpg.

See:

• https://github.com/LibreTubeApp/LibreTube/blob/master/src/server.js
• https://github.com/LibreTubeApp/LibreTube/blob/master/components/SubscriptionList/index.js#L37