Modify ghci startup file

Don't load any language extensions by default and change the prompt for
+1 coolness

ghci/.ghci

@@ -1,6 +1,4 @@
--- Enable overloaded string literals
-:set -XOverloadedStrings
 -- Enable multiline formatting
 :set +m
-:set prompt  "\ESC[1;35mλ\ESC[1;34m>\ESC[0m "
-:set prompt2 "\ESC[1;34m|\ESC[1;35m>\ESC[0m "
+:set prompt  "\ESC[1;35mλ\ESC[1;34m:\ESC[0m "
+:set prompt2 "\ESC[1;34m |\ESC[0m "