core: Support setting page through either GET or POST

Fixes #217.

Changelog.md

@@ -12,6 +12,7 @@ This file holds the changelog for Pepperminty Wiki. This is the master list of t
 ## Changed
  - Updated the [configuration guide](https://starbeamrainbowlabs.com/labs/peppermint/peppermint-config-info.php) to include count of how many settings we have
  - Also send a `x-robots-tag: noindex, nofollow` HTTP header for the login page (Semrush Bot, you better obey this one)
+ - Support `page` as either a GET parameter or a POST parameter (GET takes precedence over POST)
 
 
 ## Fixed

core/45-environment-deferred.php

@@ -5,7 +5,7 @@
 
 
 /// Finish setting up the environment object ///
-$env->page = $_GET["page"];
+$env->page = $_GET["page"] ?? $_POST["page"];
 if(isset($_GET["revision"]) and is_numeric($_GET["revision"]))
 {
 	// We have a revision number!