Merge branch 'hotfix/fixes_on_main_page'

* hotfix/fixes_on_main_page:
  add page title to pages show
  add link to contacts
  add social links
  add link to stackha page
  add mailto
add sign_in button link
Merge branch 'hotfix/add_href_to_sign_in_button' into develop

* hotfix/add_href_to_sign_in_button:
  add sign_in button link