message: feature: Implement PgUp and PgDown in the help dialog.
diff: @@ -830,6 +830,10 @@ impl App {
  0 => KillSignal::Cancel,
  sig => KillSignal::Kill(sig),
  };
  + } else if self.help_dialog_state.is_showing_help {
  + let current = &mut self.help_dialog_state.scroll_state.current_scroll_index;
  + let amount = self.help_dialog_state.height;
  + *current = current.saturating_sub(amount);
  } else if self.current_widget.widget_type.is_widget_table() {
  if let (Some((_tlc_x, tlc_y)), Some((_brc_x, brc_y))) = (
  &self.current_widget.top_left_corner,
  @@ -853,6 +857,11 @@ impl App {
  new_signal += 2;
  }
  self.delete_dialog_state.selected_signal = KillSignal::Kill(new_signal);
  + } else if self.help_dialog_state.is_showing_help {
  + let current = self.help_dialog_state.scroll_state.current_scroll_index;
  + let amount = self.help_dialog_state.height;
  +
  + self.help_scroll_to_or_max(current + amount);
  } else if self.current_widget.widget_type.is_widget_table() {
  if let (Some((_tlc_x, tlc_y)), Some((_brc_x, brc_y))) = (
  &self.current_widget.top_left_corner,
  