Move config gitignores into their own file

dotfiles/config/.gitignore

@@ -0,0 +1,40 @@
+/Trolltech.conf
+/browser-launcher2
+/chromium/
+/chromium/Avatars/
+/configstore
+/dconf/
+/dleyna-renderer-service.conf
+/evolution/
+/gconf/
+/gedit/
+/google-chrome
+/gtk-2.0/
+/gtk-3.0/
+/hexchat
+/hub
+/linuxmint/
+/menus/
+/menus/applications-merged/
+/menus/gnome-applications-merged
+/monitors.xml
+/mopidy
+/mopidy/spotify/
+/nemo/
+/pulse/
+/sparkleshare/*.key
+/sparkleshare/*.pub
+/sparkleshare/avatars/
+/sparkleshare/logs
+/spotify
+/systemd/user/default.target.wants
+/systemd/user/sockets.target.wants
+/totem/
+/transmission/dht.dat
+/transmission/resume
+/transmission/stats.json
+/transmission/torrents/
+/user-dirs.dirs
+/user-dirs.locale
+/vlc/
+/xfce4/