Update the URL for the main Groovy site
Update the URL for the main Groovy site

Happened to notice that Groovy link still pointed to the old site on Codehaus. The main Groovy logo is also coming Codehaus, but I couldn't find it on groovy-lang.org so I didn't replace it.
webkaz/groovy-website,dmesu/sdkman-website,groovy/groovy-website,sdkman/sdkman-website,rahulsom/sdkman-website,benignbala/groovy-website,marc0der/groovy-website,marc0der/groovy-website,marcoVermeulen/groovy-website,dmesu/sdkman-website,rahulsom/sdkman-website,benignbala/groovy-website,sdkman/sdkman-website,marcoVermeulen/groovy-website,webkaz/groovy-website,kevintanhongann/groovy-website,kevintanhongann/groovy-website,groovy/groovy-website