Use vim-ish keybindings for scrollback

.suckless/st/patches/st-scrollback.diff

@@ -1,13 +1,13 @@
-diff --git a/config.def.h b/config.def.h
+diff --git a/config.h b/config.h
 index 0895a1f..eef24df 100644
---- a/config.def.h
-+++ b/config.def.h
+--- a/config.h
++++ b/config.h
 @@ -188,6 +188,8 @@ static Shortcut shortcuts[] = {
  	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },
  	{ ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
  	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
-+	{ ShiftMask,            XK_Page_Up,     kscrollup,      {.i = -1} },
-+	{ ShiftMask,            XK_Page_Down,   kscrolldown,    {.i = -1} },
++	{ MODKEY|ShiftMask,     XK_K,           kscrollup,      {.i = -1} },
++	{ MODKEY|ShiftMask,     XK_J,           kscrolldown,    {.i = -1} },
  };
  
  /*