Enhance image upload and background management: Update Docker configuration to create a dedicated backgrounds directory for uploaded images, modify API routes to handle background images specifically, and improve README documentation to reflect these changes. Additionally, refactor components to utilize the new Avatar component for consistent avatar rendering across the application.

components/PlayerStats.tsx

@@ -3,6 +3,7 @@
 import { useEffect, useState } from "react";
 import { useSession } from "next-auth/react";
 import Link from "next/link";
+import Avatar from "./Avatar";
 
 interface UserData {
   username: string;
@@ -140,19 +141,12 @@ export default function PlayerStats({ initialUserData }: PlayerStatsProps) {
         href="/profile"
         className="cursor-pointer hover:opacity-80 transition-opacity"
       >
-        <div className="w-10 h-10 rounded-full border border-pixel-gold/20 overflow-hidden bg-gray-900 flex items-center justify-center">
-          {avatar ? (
-            <img
-              src={avatar}
-              alt={username}
-              className="w-full h-full object-cover"
-            />
-          ) : (
-            <span className="text-pixel-gold text-xs font-bold">
-              {username.charAt(0).toUpperCase()}
-            </span>
-          )}
-        </div>
+        <Avatar
+          src={avatar}
+          username={username}
+          size="md"
+          borderClassName="border-pixel-gold/20"
+        />
       </Link>
 
       {/* Stats */}