Add index.php as a directory default to the Getting Started wiki page

[mkdolan]

This page: https://github.com/brianwarner/facade/wiki/Getting-started

Has an issue where this section below

<Directory /home/user/facade/web/>
Options Indexes FollowSymLinks
AllowOverride All
Require all granted

Should include the directive to use index.php as the default.

<Directory /home/user/facade/web/>
Options Indexes FollowSymLinks
DirectoryIndex index.php
AllowOverride All
Require all granted