Restrcutured the database, and updated pipeline to include cover art.

MangaReader.Core/Data/SourceDescription.cs

@@ -0,0 +1,14 @@
+using MangaReader.Core.Common;
+
+namespace MangaReader.Core.Data;
+
+public class SourceDescription
+{
+    public int SourceDescriptionId { get; set; }
+
+    public int MangaSourceId { get; set; }
+    public required MangaSource MangaSource { get; set; }
+
+    public required string Text { get; set; }
+    public required Language Language { get; set; }
+}