index: Fix mysql current release and make "old notes" more global than only PHP

pages/index.html

@@ -73,8 +73,8 @@
 			</tr>
 			<tr>
 				<td class="txtright">Database</td>
-				<td><strong>MySQL 5.5.3+</strong></td>
-				<td>SQLite 3.7.4+, PostgreSQL</td>
+				<td><strong>MySQL 5.7+</strong></td>
+				<td>older MySQL versions*: 5.6+, 5.5.3+<br/>other engines: SQLite 3.7.4+, PostgreSQL </td>
 			</tr>
 			<tr>
 				<td class="txtright">Web browser</td>
@@ -84,8 +84,8 @@
 		</tbody>
 	</table>
     <p>
-    *: only PHP 5.6+ <a href="http://php.net/supported-versions.php">currently has security fixes</a> by PHP community<br>
-    </p>
+    *: be aware that open-source communities often don't support on a long term older versions.<br/>
+    Especially for PHP which will be in front of your server and have only support for 5.6+ and 7+ currently.</p>
 </div>
 
 <div class="help-title row"><h1 id="help">Are you feeling a bit confused?</h1></div>