Fixed filenames of resources that were not up to standards.

decibel/patterns/illustration_1.php

@@ -1,12 +0,0 @@
-<?php
-/**
- * Title: Illustration 1
- * Slug: decibel/illustration_1
- * Categories: illustrations
- */
-?>
-<!-- wp:image {"sizeSlug":"full","linkDestination":"none"} -->
-<figure class="wp-block-image size-full">
-	<img src="<?php echo esc_url( get_stylesheet_directory_uri() ) . '/assets/illustrations/illustration_1.jpg'; ?>" />
-</figure>
-<!-- /wp:image -->

decibel/patterns/illustration_2.php

@@ -1,12 +0,0 @@
-<?php
-/**
- * Title: Illustration 2
- * Slug: decibel/illustration_b2
- * Categories: illustrations
- */
-?>
-<!-- wp:image {"sizeSlug":"full","linkDestination":"none"} -->
-<figure class="wp-block-image size-full">
-	<img src="<?php echo esc_url( get_stylesheet_directory_uri() ) . '/assets/illustrations/illustration_2.jpg'; ?>" />
-</figure>
-<!-- /wp:image -->