(Bug 5073) Move htdocs/scss/schemes => htdocs/scss/skins
(Bug 5265, 5073) Add .row .columns container around page content

This is needed for all pages (to add space around the edge), so add it
to all pages.

Individual pages can still have their own per-section row/column
wrapper.
Merge pull request #603 from afuna/foundation-conversion-tweaks-bug5073

(Bug 5073) schemes => skins, fix spacing around edges of page