Browser support: Page for if browser !== Chrome

[remigallego]

The app works only with Chrome. Especially since the Spotify API doesn't support other browsers.

Upon loading the main app in other browsers, show a page with a similar style (Same background, same fonts) and the Winampify logo, with the following text:
"Winampify only works in Google Chrome".

[dutchtux3000]

Hello,

I can confirm that wimapify works in Firefox version 81.0 on Ubuntu 20.04.
I had problems getting it working bij disable Privacy badger on the website.
But after that I had not problems using it.

For the rest a great project.