[structure] add indexes and links to them; add archive layout
[edit] About and readme – unify principles
[edit] About: subscribe, caption fix, more
principles − pattern-second (also in readme)
[edit] [config] *breaking* new srcset variables; updated posts
[style] [config] rework figure/figcaption styles; update pattern library
also, no more <q>-specific style
Merge pull request #74 from opattison/2014-11-29-content

2014-11-29 Content – resolves #61
Merge branch 'master' into 2014-11-28-indexes