2021.12.02

• Fixed error in template partials/_kniga.html.ep in Slovo::Themes::Malka.
• Returned again to showing the celina used for title of a stranica in
  Slovo::Controller::Celini->index().
• Added social icons from materialdesignicons.com and icon-icons.com to
  Slovo::Plugin::Themes::Malka and used them in the footer. Slightly
  improved CSS for mobile devices.
• Enabled partials/_right.html.ep and added to it to
  enable plugins to put there content.
• Moved Plugins TagHelpers and DefaultHelpers to slovo.conf just after
  Authentication plugin to allow their helpers to be used by plugins which
  load next and still override Authentication's is_user_authenticated.
• Added two new helpers to TagHelpers plugin to allow other plugins to put
  css and js files to $app->defaults so they are automatically available in
  stash as and <script> tags. Used the new feature in Malka.pm