docs: add information on new mode toggle button

That toggles between PDF mode and Presentation mode.

Author: Tygo-van-den-Hurk

docs/input-bindings.md

@@ -4,12 +4,16 @@ Slyde uses keybindings, and mouse events to make your life easier. I tried to st
 
 ## Next Slide
 
-Press one of the following keys to go to the next slide: `Enter`, `Space`, `d`, `l`, `PageUp`, and `ArrowRight`. As well as pressing the primary mouse button, or scrolling down.
+Press one of the following keys to go to the next slide: `Enter`, `Tab`, `Space`, `d`, `l`, `PageUp`, and `ArrowDown`, `ArrowRight`. As well as pressing the primary mouse button, or scrolling down.
 
 ## Previous Slide
 
-Press one of the following keys to go to the previous slide: `a`, `h`, `PageDown`, and `ArrowLeft`. As well as pressing the secondary mouse button, or scrolling up.
+Press one of the following keys to go to the previous slide: `a`, `h`, `PageDown`, `ArrowUp` and `ArrowLeft`. As well as pressing the secondary mouse button, or scrolling up.
 
 ## Full Screen
 
-Press `F11` or `f` to toggle between full screen mode and a normal browser window.
+Press `F11` or `f` to toggle between full screen mode and a normal browser window, and press `F11`, `f`. or `ESC` to return to normal.
+
+## Presentation / PDF mode
+
+Press `p` to toggle between presentation and PDF mode with ease.