uniweb: Update styleguide

uniweb/templates/uniweb/base.html

uniweb/templates/uniweb/blocks/advanced_text.html

uniweb/templates/uniweb/blocks/advanced_text_columns.html

uniweb/templates/uniweb/blocks/advanced_title.html

uniweb/templates/uniweb/blocks/gallery.html

uniweb/templates/uniweb/blocks/picture_list.html

uniweb/templates/uniweb/blocks/table.html

uniweb/templates/uniweb/blocks/text.html

uniweb/templates/uniweb/blocks/text_columns.html

uniweb/templates/uniweb/blocks/title.html

uniweb/templates/uniweb/snippet_sections.html