Improve a bit ikiwiki detection (#1824)

* Improve a bit ikiwiki detection

This can be verified
[here](http://blog.spang.cc/posts/hledger_rocks_my_world/). Apparently
people may put ikiwiki in the good ol' `/cgi-bin` folder instead of the
root of their website. This makes sense, since ikiwiki is a big pile of
Perl.

* Fix a typo

src/apps.json

@@ -10223,8 +10223,8 @@
 				"8"
 			],
 			"html": [
-				"<link rel=\"alternate\" type=\"application/x-wiki\" title=\"Edit this page\" href=\"/ikiwiki\\.cgi",
-				"<a href=\"/ikiwiki\\.cgi\\?do="
+				"<link rel=\"alternate\" type=\"application/x-wiki\" title=\"Edit this page\" href=\"[^\"]*/ikiwiki\\.cgi",
+				"<a href=\"/(?:cgi-bin/)?ikiwiki\\.cgi\\?do="
 			],
 			"icon": "ikiwiki.png",
 			"website": "http://ikiwiki.info"