Revert "Integration page"

This reverts commit 3415b62d2d.

examples/stm32/nucleo-f746zg-make-baremetal-builtin/main.c

@@ -24,7 +24,7 @@ void mg_random(void *buf, size_t len) {  // Use on-board RNG
 }
 
 static void timer_fn(void *arg) {
-  //gpio_toggle(LED);                                      // Blink LED
+  gpio_toggle(LED);                                      // Blink LED
   struct mg_tcpip_if *ifp = arg;                         // And show
   const char *names[] = {"down", "up", "req", "ready"};  // network stats
   MG_INFO(("Ethernet: %s, IP: %M, rx:%u, tx:%u, dr:%u, er:%u",
@@ -32,13 +32,6 @@ static void timer_fn(void *arg) {
            ifp->ndrop, ifp->nerr));
 }
 
-bool led_get(void) {
-  return gpio_read(LED);
-}
-void led_set(bool val) {
-  gpio_write(LED, val);
-}
-
 int main(void) {
   gpio_output(LED);               // Setup green LED
   uart_init(UART_DEBUG, 115200);  // Initialise debug printf