Replace Fluxer icon with Discord's, as fluxer isn't an icon on Vitepress

Replaced the 'fluxer' social link icon with 'discord'.

Signed-off-by: Diego Pireddu <118828188+DionKill@users.noreply.github.com>

Author: DionKill

docs/.vitepress/config.js

@@ -98,7 +98,7 @@ export default defineConfig({
 
     socialLinks: [
       { icon: 'discord', link: 'https://discord.com/invite/QtcPmzHVVm' },
-      { icon: 'fluxer', link: 'https://fluxer.gg/b7fFDGsY' },
+      { icon: 'discord', link: 'https://fluxer.gg/b7fFDGsY' },
       { icon: 'github', link: 'https://github.com/DionKill/ps4-linux-tutorial/' },
     ],