Update Doxyfile for the search functionality.

This also means I can finally get rid of that "sorry this is crappy"
disclaimer on the top.

Doxyfile-mcss

@@ -77,8 +77,6 @@ HTML_EXTRA_STYLESHEET = \
     https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,400i,600,600i%7CSource+Code+Pro:400,400i,600&subset=latin-ext \
     ../css/m-dark+doxygen.compiled.css
 
-M_PAGE_HEADER = "<div class=\"m-note m-dim\">This is a snapshot of a work-in-progress documentation theme. If you feel lost, miss something, or want to see the original Doxygen docs instead, head over to the <a href="../../doc/html/{filename}" rel="nofollow">archived version of this documentation page</a>.</div>"
-
 M_PAGE_FINE_PRINT = "<p>Magnum docs. Part of the <a href="http://magnum.graphics/">Magnum project</a>, copyright © <a href="http://mosra.cz/">Vladimír Vondruš</a> and contributors, 2010&ndash;2018.<br />Generated by <a href="http://doxygen.org/">Doxygen</a> {doxygen_version} and <a href="http://mcss.mosra.cz/">m.css</a>. Contact the team via <a href="https://github.com/mosra/magnum">GitHub</a>, <a href="https://gitter.im/mosra/magnum">Gitter</a>, <a href="mailto:info@magnum.graphics">e-mail</a> or <a href="https://twitter.com/czmosra">Twitter</a>.</p>"
 
 # kate: hl Doxyfile

Doxyfile-public

@@ -78,6 +78,8 @@ HTML_EXTRA_STYLESHEET = \
     http://static.magnum.graphics/m-dark.compiled.css \
     http://static.magnum.graphics/m-dark.doxygen.compiled.css
 
-M_PAGE_HEADER = "<div class=\"m-note m-dim\">This is a snapshot of a work-in-progress documentation theme. If you feel lost, miss something, or want to see the original Doxygen docs instead, head over to the <a href="http://doc.magnum.graphics/magnum-archive/{filename}" rel="nofollow">archived version of this documentation page</a>.</div>"
+M_SEARCH_DOWNLOAD_BINARY = YES
+
+M_SEARCH_EXTERNAL_URL = "https://google.com/search?q=site:doc.magnum.graphics+Magnum+{query}"
 
 # kate: hl Doxyfile