Change banner to technical writing

pages/writing.php

@@ -5,6 +5,8 @@ $tagline = 'tutorials, manuals, reports…';
 $description = 'I do technical writing, revisions, translations, and such.';
 $keywords = 'music, learning, tabletop, research, technical, writing';
 $twitter_image = 'images/colopic.jpg';
+$banner_image = 'images/banner_writing-2x.jpg';
+$banner_image_half = 'images/banner_writing.jpg';
 ?>
 
 <?=i('_header')?>