dashboard entrusted resources [#84761392]
extract 'living styleguide' builder into module

also add a unit test
cider conf: whitespace
cider conf: add styleguide-conformity_defaults
add HAML-Lint (gem, config file, cider spec)
styleguide: add test, fix errors

- per-element-screenshots are shall hashed and checked
styleguide: generate shasums
styleguide: add generated hashes
styleguide: enable test for all elements
styleguide: generate shasums
styleguide: add generated hashes (all elements)
styleguide: remove hover effects (for predictable screenshots)
styleguide: keep screenshots in cider (debug)