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/components/navbar/ReaderNavBar.tsx

@@ -267,6 +267,7 @@ export default function ReaderNavBar(props: IProps) {
                             skipDupChapters={settings.skipDupChapters}
                             fitPageToWindow={settings.fitPageToWindow}
                             readerType={settings.readerType}
+                            offsetFirstPage={settings.offsetFirstPage}
                         />
                     </Collapse>
                     <Divider sx={{ my: 1, mx: 2 }} />