Nearly Duplicate sections in documentation

I was reading the documentation when I noticed that these two sections

• http://www.groovy-lang.org/download.html
• http://www.groovy-lang.org/install.html

are nearly duplicate. It seems that due to duplicatacy both of them have some information which the other one does not have. It would be better to merge them into single section.

I would suggest to just keep the download section as it is better looking. Merge the extra information from install section and then delete the install section.