style: small fixes
data: rename
template: build a better responsive grid

- uses custom handlebars helper {{#ifNth}}
- does not filter with {{#if} (count would be off for the grid rows/clearfixes)

helper submitted upstream <https://github.com/assemble/handlebars-helpers/commit/20414197a8f36d464c20ef4efa6cbc545d2078f8>,
using forked libraries interim.
template: better debug section
template: footer is list of paragraphs
template: use fallback lorem ipsum if no text
template: fix name i img.alt, correct jquery embed, typos
data: #hotfix: lindaschumann.de !
#dist: add generated HTML