Set website so it appears in ruby --help

* Update launcher specs to handle the new output.
* Prefer --help:ruby to --help:languages.

Author: eregon

spec/tags/truffle/launcher_tags.txt

@@ -86,3 +86,4 @@ slow:The launcher supports running typeprof symlinked
 fails(https://github.com/ruby/typeprof/issues/64):The launcher runs typeprof as an -S command
 fails(https://github.com/ruby/typeprof/issues/64):The launcher supports running typeprof in any of the bin/ directories
 fails(https://github.com/ruby/typeprof/issues/64):The launcher supports running typeprof symlinked
+slow:The launcher prints help:ruby containing ruby language options

spec/truffle/launcher_spec.rb

@@ -344,22 +344,13 @@ def should_print_full_java_command(options, env: {})
     end
   end
 
-  it "prints help:languages containing ruby language options" do
-    out = ruby_exe(nil, options: "--help:languages", args: @redirect)
+  it "prints help:ruby containing ruby language options" do
+    out = ruby_exe(nil, options: "--help:ruby", args: @redirect)
     check_status_and_empty_stderr
-    out.should =~ /language options/i
-    out.should include("Ruby:")
-    out.should include("--ruby.load-paths=")
-  end
-
-  guard -> { defined?(::TruffleRuby) &&TruffleRuby.cexts? } do
-    it "prints help:languages containing llvm language options" do
-      out = ruby_exe(nil, options: "--help:languages", args: @redirect)
-      check_status_and_empty_stderr
-      out.should =~ /language options/i
-      out.should include("LLVM:")
-      out.should include("--llvm.libraryPath=")
-    end
+    out.should =~ /Language options/i
+    out.should =~ /\bRuby\b/
+    out.should.include?('https://www.graalvm.org/ruby/')
+    out.should.include?("--ruby.load-paths=")
   end
 
   it "prints the version with --version" do

src/main/java/org/truffleruby/RubyLanguage.java

@@ -135,6 +135,7 @@
 
 @TruffleLanguage.Registration(
         name = "Ruby",
+        website = "https://www.graalvm.org/ruby/",
         contextPolicy = ContextPolicy.SHARED,
         id = TruffleRuby.LANGUAGE_ID,
         implementationName = TruffleRuby.FORMAL_NAME,