Import doc improvements made in Java sub-site
Import doc improvements made in Java sub-site

- Shuffled some sections around to have the recommended ones show up
  first
- Switched to '#' headers
- Improved the download links
- Made the RPM commands explicit
- Improved some wording

shadyysf/ImportedFromSomewhere,shadyysf/ImportedFromSomewhere,shadyysf/ImportedFromSomewhere,shadyysf/ImportedFromSomewhere