[gimp-web: 12/12] Add development downloads page

[Michael Schumacher <schumaml src gnome org>]

commit f3dbc2493865ce8b4bcb6d4ce052a9a0cdc80fe2
Merge: c3ae451 8a43fbb
Author: Michael Schumacher <schumaml gmx de>
Date:   Fri Aug 25 23:37:04 2017 +0200

    Add development downloads page
    
    The stable and development downloads pages have conditional links to each other. The development
    downloads pages has a conditional message checking for the presence of the macOS package and its
    version. If this works fine, it should be extended to all downloads where appropriate.

 GIMP_VERSIONS                                      |   26 +++++++++++++----
 content/downloads/devel/index.md                   |   10 ++++++
 .../newgimp/templates/downloads-development.html   |   31 ++++++++++++++------
 themes/newgimp/templates/downloads.html            |    3 ++
 4 files changed, 55 insertions(+), 15 deletions(-)
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