Refactored DB to be Series->Volumes->Chapters instead. All functionality that previously worked still works. Cleanup still needed.

API/Interfaces/IVolumeRepository.cs

@@ -0,0 +1,15 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using API.DTOs;
+using API.Entities;
+
+namespace API.Interfaces
+{
+    public interface IVolumeRepository
+    {
+        void Update(Volume volume);
+        Task<Chapter> GetChapterAsync(int chapterId);
+        Task<ChapterDto> GetChapterDtoAsync(int chapterId);
+        Task<IList<MangaFile>> GetFilesForChapter(int chapterId);
+    }
+}