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The first step is always "index.html", the second "adress" is the "index.php". You have both. So what to do?
You may delete the index.html, thereafter the index.php will be the first page. If you don´t like to delete your intro you have to put a refresh in it: (in the headersection)
<meta http-equiv="refresh" content="5;url=index.php]">
So the index.html will change in 5 seconds to index.php.
Hope, this will be a way