docs: add hub screenshots and remove extension screenshots

fix: modal window now closes after oauth2 login

feat: remove post_categories/imports_controller.rb

feat: add better search by title to the Things Search Query

Merge branch 'master' of https://github.com/woto/hub

feat: enable rack-cors for api

chore: version bump

feat: rewrite yandex extractor and add extracting from html, also add…

… displaying metadata in mentions

test: fix post_categoris/destroy_spec.rb

feat: move entity intro outside of accordion