fix bug with sequence gallery

fixes #176
Merge branch 'bug/sequence-gallery' into release/1.3.2
Merge branch 'bug/chapter-script' into release/1.3.2
fix parallax floater markup
Merge branch 'bug/parallax-floater' into release/1.3.2
1.3.2
Merge branch 'release/1.3.2' into feature/chapter-improvements