Squash warnings about non-static methods in the page renderer

Changelog.md

@@ -20,6 +20,7 @@ This file holds the changelog for Pepperminty Wiki. This is the master list of t
      - Hide site logo from screen readers
  - Lists of pages that have a specific tag will now be sorted alphabetically (unicode characters should be handled correctly too)
  - Support Unicode characters when sorting. If it's a list of something, then it's now sorted correctly (e.g. includes pages, tags, etc).
+ - Squashed a bunch of warnings about a non-static methid in the page renderer
 
 ### Changed
  - Made `build.sh` build script more robust, especially when generating the documentation.

core/40-page-renderer.php

@@ -342,7 +342,7 @@ class page_renderer
 	 * @package core
 	 * @param string $scriptUrl The url of the javascript file to reference.
 	 */
-	public function add_js_link(string $scriptUrl) {
+	public static function add_js_link(string $scriptUrl) {
 		static::$jsLinks[] = $scriptUrl;
 	}
 	/**
@@ -350,7 +350,7 @@ class page_renderer
 	 * @package core
 	 * @param string $script The snippet of javascript to add.
 	 */
-	public function add_js_snippet(string $script) {
+	public static function add_js_snippet(string $script) {
 		static::$jsSnippets[] = $script;
 	}
 	/**