Added htmlGallery

Updated SDJB_htmlBase

Added htmlGallery to the collection.

Added Previously:
SDJB_UnifiedFusionBridge/Controller (2-in-1)
SDJB_htmlMenu
SDJB_htmlCircularMenu
SDJB_TicTactToe

if you got suggestion, feedback, leave them behind, as CSS can be complicated to understand.
even there are some nice insight to be found, and some I don't know about.

Keep in mind that some CSS like the gallery has a transform styling  on opening and closing.
this is hightly optional, and you could remove the scaling/rotateZ option if you dislike it
or alter it. 

CSS styling with the given layout is how to style it, modifiy it minimal or heavely to suit your needs.