enable proxy and new ruby rules

files/squid/helpers/rules.d/opendsa.rules

 // OpenDSA
 
-^.* false
+// ^.* false
 
 ^https?://www\.ida\.liu\.se/edu/ugrad/datortenta/OpenDSA/Books/.*                false
 ^https?://www\.ida\.liu\.se/edu/ugrad/datortenta/OpenDSA/lib/.*                  true

files/squid/helpers/rules.d/ruby.rules

 // Ruby documentation
-^https?://ruby-doc\.org/.*  true
-^https?://rubular\.com/.*   true
-^https?://api\.rubygems\.org/.* true
+
+// new 2020
+// Följande webbresurser ska vara tillgängliga för studenterna under duggan:
+^https?://ruby-doc\.org/core-2\.7\.0/.*                true
+^https?://ruby-doc\.org/stdlib-2\.7\.0/.*	       true
+^https?://rubular\.com/.*			       true
+^https?://docs\.ruby-doc\.com/docs/ProgrammingRuby/.*  true
+
+// Old
+// ^https?://ruby-doc\.org/.*  true
+// ^https?://rubular\.com/.*   true
+// ^https?://api\.rubygems\.org/.* true