Remove more dead code

Author: Andres Ugarte

src/core/RMXRemixer.h

@@ -34,9 +34,6 @@ NS_ASSUME_NONNULL_BEGIN
 /** Stops the current Remixer session. */
 + (void)stop;
 
-/** Sends an invitation to the web dashboard. */
-+ (void)sendEmailInvite;
-
 /** A unique session id. */
 + (NSString *)sessionId;
 

src/core/UI/RMXOverlayViewController.m

@@ -91,9 +91,6 @@ - (void)viewDidLoad {
   [(UIButton *)item.leftBarButtonItem.customView addTarget:self
                                                     action:@selector(dismissOverlay:)
                                           forControlEvents:UIControlEventTouchUpInside];
-  [(UIButton *)item.rightBarButtonItem.customView addTarget:self
-                                                     action:@selector(sendEmailInvite:)
-                                           forControlEvents:UIControlEventTouchUpInside];
   _panGestureRecognizer =
       [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(didPan:)];
   _panGestureRecognizer.delegate = self;
@@ -228,10 +225,6 @@ - (void)reloadData {
   [self.view.tableView reloadData];
 }
 
-- (void)sendEmailInvite:(id)sender {
-  [RMXRemixer sendEmailInvite];
-}
-
 #pragma mark - UITableViewDataSource
 
 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {