/controllers/back-office/ & /views/back-office/pages/: moved article page to /.../pages/articles/list.html
/resources/scss/ & /tools/: added min-height: 1px to cell- classes because empty cells were not doing anything
/resources/scss/: cleaned button-labeled code a bit and added input-group-inline class
/controllers/, /resources/ & /views/back-office/pages/articles/: added article edition page