Add links to purchase the printed manual

I've put the first versions of the manual up for sale on Lulu.com, based
on the generated PDFs from my freedoom/freedoom#1506 PR. The manual
contents are unfortunately coming midway between releases, but we'll
update the versions for sale when the next proper release happens.

Author: fragglet

img/printed-freedoom-manual.jpg

@@ -80,6 +80,35 @@ <h3>Contents</h3>
 <div class="paragraph"><p>We are interested in translating Freedoom&#8217;s manual into more languages. If you
 speak other languages not listed above, we could use your help! Join the
 Freedoom Discord and ask how you can help out.</p></div>
+<div class="imageblock" style="float:right;">
+<div class="content">
+<img src="img/printed-freedoom-manual.jpg" alt="Photo of printed Freedoom manual" width="200px">
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_printed_manuals">Printed manuals</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Printed copies of the manual are now available to purchase on Lulu.com. Click
+below to purchase your copy.</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="https://www.lulu.com/shop/simon-howard/freedoom-manual-english/paperback/product-zmykn7d.html">Freedoom Manual (English)</a>
+</p>
+</li>
+<li>
+<p>
+<a href="https://www.lulu.com/shop/simon-howard/freedoom-manual-espa%C3%B1ol/paperback/product-9596pqz.html">Freedoom Manual (Español)</a>
+</p>
+</li>
+<li>
+<p>
+<a href="https://www.lulu.com/shop/simon-howard/freedoom-manual-fran%C3%A7ais/paperback/product-rm6zygy.html">Freedoom Manual (Français)</a>
+</p>
+</li>
+</ul></div>
 </div>
 </div>
 <p></p>

manual.html

@@ -11,3 +11,14 @@ languages:
 We are interested in translating Freedoom's manual into more languages. If you
 speak other languages not listed above, we could use your help! Join the
 Freedoom Discord and ask how you can help out.
+
+image::img/printed-freedoom-manual.jpg[alt="Photo of printed Freedoom manual",float="right",width="200px"]
+
+== Printed manuals
+
+Printed copies of the manual are now available to purchase on Lulu.com. Click
+below to purchase your copy.
+
+  * link:https://www.lulu.com/shop/simon-howard/freedoom-manual-english/paperback/product-zmykn7d.html[Freedoom Manual (English)]
+  * link:https://www.lulu.com/shop/simon-howard/freedoom-manual-espa%C3%B1ol/paperback/product-9596pqz.html[Freedoom Manual (Español)]
+  * link:https://www.lulu.com/shop/simon-howard/freedoom-manual-fran%C3%A7ais/paperback/product-rm6zygy.html[Freedoom Manual (Français)]

manual.txt

@@ -19,6 +19,11 @@ li > p {
   padding-top: 0;
   padding-bottom: 0;
 }
+
+hr {
+  clear: both;
+}
+
 /* some basics: a colour and font settings */
 body {
   background-color: #c6dcd1;