rewrote the Anime.svelte to move out helper functions and clean up code

AniListTypes.go

@@ -43,6 +43,12 @@ type AniListGetSingleAnime struct {
 	} `json:"data"`
 }
 
+type AniListUpdateReturn struct {
+	Data struct {
+		SaveMediaListEntry MediaList `json:"SaveMediaListEntry"`
+	}
+}
+
 type MediaList struct {
 	ID      int `json:"id"`
 	MediaID int `json:"mediaId"`