starting to refactor to put things in subdirectories

testing with just the learnmore pages
improve dev experience working with this site (offline and simpler)

plugin which allows using local files so we can develop offline, used in several places;
and tweak the config instructions and scripting mechanism to use this, and not to need scripts for debug usage, and to have fewer files in root
move Gemfile info to _scripts directory
rename layouts to website-*
move things to _build dir, and move fonts to deps/bootstrap-fonts/
remove selectNav; appears not to be linked anywhere
add back in underscore to custom JS dir, because it is hardcoded in catalog html files
remove link to (absent) css map file for bootstrap
rename theme.css to website.css; remove unused new-style.css; and move bootstrap-theme to deps
add config.yaml  site.path.website  var in prep for merger to brooklyn main codebase
replace site.url with site.path.website
move things to website/ subdir, update site-structure plugin to work better with that, and have placeholder index.md in root
convert site-structure links to be relative paths (preferred)
place website files in root during production build, and fix ruby errors
address @rdowner's code review comments
explicitly set utf-8 encoding, just in case needed
wipe everything and replace with a single README pointing at new merged location
Merge and close #18