Fix bugs, use plural post slugs, move actions and filters into hooks folder

admin/hooks/after-setup-theme.php

@@ -0,0 +1,5 @@
+<?php
+function sportspress_after_setup_theme() {
+	add_theme_support( 'post-thumbnails' );
+}
+add_action( 'after_setup_theme', 'sportspress_after_setup_theme' );