WIP add admin suite: add Dashboard, add controller for topic entity

assets/js/app.js

assets/scss/app.scss

config/packages/assets.yaml

config/packages/prod/webpack_encore.yaml

config/packages/security.yaml

config/packages/test/webpack_encore.yaml

config/packages/webpack_encore.yaml

src/Controller/Admin/AdminController.php

src/Controller/Admin/TopicController.php

src/Controller/MainController.php

src/Security/AdminLoginAuthenticator.php

templates/admin/dashboard.html.twig

templates/index.html.twig