Update kdesrc-build website.
Original patch written by Burkhard Lück.
- version bump to 16.05
- fixes broken links to docs.kde.org
- removes download section
- updates Kate syntax highlighter section.
My additions:
- remove needless link to 'latest release' (just use git now as specified on front page)
- version bump to '-git' in case any pages now refer to latest version.
REVIEW:129201