Remove FTP proxy which is no longer supported by browsers (#1901)

Author: whimboo

index.html

@@ -1618,15 +1618,6 @@ <h3>Proxy</h3>
   <td>Any <a>URL</a>.
  </tr>
 
- <tr>
-  <td><code>ftpProxy</code>
-  <td>string
-  <td>Defines the proxy <a>host</a> for FTP traffic when
-   the <a><code>proxyType</code></a> is "<code>manual</code>".
-  <td>A <a>host and optional port</a> for
-   scheme "<code>ftp</code>".
- </tr>
-
  <tr>
   <td><code>httpProxy</code>
   <td>string