Open gallery application template in github

[timotheeguerin]

fix #1218

[codecov]

Codecov Report

Merging #1252 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1252   +/-   ##
======================================
  Coverage    53.4%   53.4%           
======================================
  Files         958     958           
  Lines       22133   22133           
  Branches     2466    2466           
======================================
  Hits        11821   11821           
  Misses      10312   10312

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