Add option to offset first page in double page reader (#418)

* added toggle for doublespreads

* changing pages works as intended

* undid package.json changes

* deleted packege lock json

* curPage changes when changing invertDoublePage

* changed yarn.lock

* it switches better now

* fixed formatting

* changed it to offset first page

* fixed flipping when switching

* offset first page hides when double page is not enabled

* removed uncreachable line

src/screens/settings/DefaultReaderSettings.tsx

@@ -65,6 +65,7 @@ export default function DefaultReaderSettings() {
             skipDupChapters={settings.skipDupChapters}
             fitPageToWindow={settings.fitPageToWindow}
             readerType={settings.readerType}
+            offsetFirstPage={settings.offsetFirstPage}
         />
     );
 }