Add a button to reset read location

This will be more useful when text to speech updates read position
while listening, gives the user more control and makes it easier
to handle scrolling back in an article.

apple/OmnivoreKit/Sources/App/Views/WebReader/WebReaderContainer.swift

@@ -175,6 +175,12 @@ struct WebReaderContainerView: View {
                 )
               }
             )
+            Button(
+              action: {
+                dataService.updateLinkReadingProgress(itemID: item.unwrappedID, readingProgress: 0, anchorIndex: 0)
+              },
+              label: { Label("Reset Read Location", systemImage: "arrow.counterclockwise.circle") }
+            )
             Button(
               action: { shareActionID = UUID() },
               label: { Label("Share Original", systemImage: "square.and.arrow.up") }