Use 512x512 user profile pictures (#826)

DiscordChatExporter.Core/Discord/Data/User.cs

@@ -30,7 +30,7 @@ public partial record User
             ? "gif"
             : "png";
 
-        return $"https://cdn.discordapp.com/avatars/{id}/{avatarHash}.{extension}?size=128";
+        return $"https://cdn.discordapp.com/avatars/{id}/{avatarHash}.{extension}?size=512";
     }
 
     public static User Parse(JsonElement json)
@@ -47,4 +47,4 @@ public partial record User
 
         return new User(id, isBot, discriminator, name, avatarUrl);
     }
-}
+}

DiscordChatExporter.Core/Exporting/Writers/Html/PreambleTemplate.cshtml

@@ -302,6 +302,7 @@
             border-radius: 50%;
             width: 40px;
             height: 40px;
+            image-rendering: high-quality;
         }
 
         .chatlog__messages {
@@ -777,4 +778,4 @@
 </div>
 
 @{/* Preamble cuts off at this point */}
-<div class="chatlog">
+<div class="chatlog">