Update the webpage (#1820)

* Add docs of extensions
  * Use `category` to distinct dropdown pages
  * Sort the documents alphabetical

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

03.API-EXAMPLE.md

@@ -1,6 +1,7 @@
 ---
 layout: page
 title: API Examples
+category: navbar
 permalink: /api-example/
 ---
 
@@ -182,38 +183,38 @@ created by API functions has the error flag set.
 The following example function will output a JavaScript value:
 
 ```c
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "jerryscript.h"
-#include "jerryscript-port.h"
 
 static void
 print_value (const jerry_value_t value)
 {
   if (jerry_value_is_undefined (value))
   {
-    jerry_port_console ("undefined");
+    printf ("undefined");
   }
   else if (jerry_value_is_null (value))
   {
-    jerry_port_console ("null");
+    printf ("null");
   }
   else if (jerry_value_is_boolean (value))
   {
     if (jerry_get_boolean_value (value))
     {
-      jerry_port_console ("true");
+      printf ("true");
     }
     else
     {
-      jerry_port_console ("false");
+      printf ("false");
     }
   }
   /* Float value */
   else if (jerry_value_is_number (value))
   {
-    jerry_port_console ("number");
+    printf ("number");
   }
   /* String value */
   else if (jerry_value_is_string (value))
@@ -225,15 +226,15 @@ print_value (const jerry_value_t value)
     jerry_string_to_char_buffer (value, str_buf_p, req_sz);
     str_buf_p[req_sz] = '\0';
 
-    jerry_port_console ("%s", (const char *) str_buf_p);
+    printf ("%s", (const char *) str_buf_p);
   }
   /* Object reference */
   else if (jerry_value_is_object (value))
   {
-    jerry_port_console ("[JS object]");
+    printf ("[JS object]");
   }
 
-  jerry_port_console ("\n");
+  printf ("\n");
 }
 ```
 
@@ -252,11 +253,11 @@ Shell operation can be described with the following loop:
   - loop.
 
 ```c
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "jerryscript.h"
-#include "jerryscript-port.h"
 
 static void print_value (const jerry_value_t);
 
@@ -274,7 +275,7 @@ main (int argc, char *argv[])
     char *cmd_tail = cmd;
     size_t len = 0;
 
-    jerry_port_console ("> ");
+    printf ("> ");
 
     /* Read next command */
     while (true)
@@ -311,7 +312,7 @@ main (int argc, char *argv[])
     {
       /* Evaluated JS code thrown an exception
        *  and didn't handle it with try-catch-finally */
-      jerry_port_console ("Unhandled JS exception occured: ");
+      printf ("Unhandled JS exception occured: ");
     }
 
     print_value (ret_val);