Gallery feature added

1. Default homepage for gallery contains image 1 scaled to fit screen width.
2. Images have numbering with total of images in that gallery. i.e. 2/20
3. ‘View next image’ button added below image, which when clicked, loads the next image directly below.
4. ‘View all images’ button added below ‘View next image’ button, which when clicked, opens View All Images page.
5. View all images page consists of two columns of images. Images are scaled to fit column width. Images numbering is from top to bottom irrelevant of column. Images in columns do not need to be aligned horizontally, except for the first two images at the top of the gallery.