script/gen_gallery.py: make gallery html-only, tweak formatting of index files
script/gen_gallery.py: make gallery html-only, tweak formatting of index files

BubuLK/sfepy,rc/sfepy,vlukes/sfepy,vlukes/sfepy,vlukes/sfepy,BubuLK/sfepy,rc/sfepy,sfepy/sfepy,rc/sfepy,sfepy/sfepy,sfepy/sfepy,BubuLK/sfepy