Thread:Manual talk:Configuring MediaWiki/Kill this, overlap with Manual:Configuration Configuring MediaWiki

We already have Manual:Configuration with more links and more useful information. Manual:Installing MediaWiki talks about installing the rest of the stack so there's benefit and precedent to explaining configuration of the rest of the stack along with MediaWiki.

Things to do.
 * change Template:InstallationNav to link to Manual:Configuration
 * Manual:Installing MediaWiki links here for "links to more advanced configuration", but that's not useful.