Update the Projects page.

src/ssg/input/crap/index.html.twig

@@ -11,7 +11,7 @@ title: 'The Folder of Crap'
 {% block content %}
     <p>This is the home of random things that I want to publish that
         don't warrant their own separate pages.</p>
-    <h2>Colouring pages</h2>
+    <h2 id="colouring-pages">Colouring pages</h2>
     <p>During a <a href="https://en.wikipedia.org/wiki/COVID-19_pandemic">lengthy
         period of staying at home</a>, I started drawing some colouring
         pages with the idea of turning it into a regularly-updated

src/ssg/input/projects/index.html.twig

@@ -62,6 +62,10 @@ title: 'Projects'
             'description': 'Written in Haxe, Bastard Snake set out to be a Snake clone that didn’t like you getting many points, but only got as far as making collecting points slightly inconvenient.',
             'url': 'https://github.com/damiendart/bastardsnake',
         },
+        'Colouring pages': {
+            'description': 'During the COVID-19 pandemic, I started drawing some free-to-download colouring pages with the idea of turning it into a regularly-updated thing. I lost interest after five pages.',
+            'url': 'https://www.robotinaponcho.net/crap/#colouring-pages',
+        },
         'knr-solutions': {
             'description': 'My incomplete set of solutions to the exercises in <em>The C Programming Language (Second Edition).</em>',
             'url': 'https://github.com/damiendart/knr-solutions',
@@ -107,8 +111,6 @@ title: 'Projects'
         {% endfor %}
     </dl>
 
-    <p>See also <a href="/crap/">The Folder of Crap</a>.</p>
-
     <h2 id="inactive">Abandoned and deprecated projects</h2>
     <dl>
         {% for title, project in inactiveProjects %}