Remove dhtcrawler from the package index

The URIs don't work for non-logged in users.

Choosing to remove for now because the project also changed
(there's a dhtcrawler2) so it might be worth adding this one
instead (although it probably won't be compatible with Erlang.mk
right now and seems to be more of a standalone repository).

index/dhtcrawler.mk

@@ -1,7 +0,0 @@
-PACKAGES += dhtcrawler
-pkg_dhtcrawler_name = dhtcrawler
-pkg_dhtcrawler_description = dhtcrawler is a DHT crawler written in erlang. It can join a DHT network and crawl many P2P torrents.
-pkg_dhtcrawler_homepage = https://github.com/kevinlynx/dhtcrawler
-pkg_dhtcrawler_fetch = git
-pkg_dhtcrawler_repo = https://github.com/kevinlynx/dhtcrawler
-pkg_dhtcrawler_commit = master