Add link to the RuneScape Preservation Unit wiki page

Signed-off-by: Graham <gpe@openrs2.org>

archive/src/main/resources/org/openrs2/archive/templates/index.html

@@ -60,6 +60,7 @@
 						<!-- <li><a href="https://rs-hacking.com/">RS-Hacking</a></li> -->
 						<li><a href="https://runearchive.org/">RuneArchive</a></li>
 						<li><a href="https://runelite.net/">RuneLite</a></li>
+						<li><a href="https://runescape.wiki/w/User:Manpaint55/RPU">The RuneScape Preservation Unit</a></li>
 						<li><a href="http://runestar.org/">RuneStar</a></li>
 						<li><a href="https://www.runewiki.org/">RuneWiki</a></li>
 					</ul>