Add beta curriculum slide-like flow
Move up one level to avoid pathing issues
Tune styling for usable layout and content spacing
Tweak sample (beta) content for demo
Replace all svg include with standard image markdown
Tune up styling, padding, margin

Top of page spacing is not due to misbehaving CSS but markdown
generation. Apply reasonable margins and padding to text elements.
Deprecate SnapSVG need, using Markdown embeds

Dispensing with all SVG injection and JavaScript needs in favor of
Markdown image syntax and direct SVG embedding.
Remove all "boundary" elements from SVG diagrams
Add scroll snap support
Tune styles for better flow
Add JS dependencies for scroll snap support
Remove static copy of dependencies
Add scrollsnap as submodule
Merge pull request #196 from github/beta-curriculum-layout

Add curriculum slide+resources layout beta dark ship