File Created Date (#1434)

* Capture date when Kavita creates a MangaFile so we can show the date on the UI.

* On startup, exit early for migration directory if it's a fresh install and we have migrations to run but no settings stored yet.

* Blur summaries should apply when there isn't any read more collapsable

* Fixed custom theme files not loading.

* Cleaned up the logic for displaying the manga file date

API/Data/Migrations/DataContextModelSnapshot.cs

@@ -525,6 +525,9 @@ namespace API.Data.Migrations
                     b.Property<int>("ChapterId")
                         .HasColumnType("INTEGER");
 
+                    b.Property<DateTime>("Created")
+                        .HasColumnType("TEXT");
+
                     b.Property<string>("FilePath")
                         .HasColumnType("TEXT");