Add hover effect and slim class to dev assets and apply in signature list

Introduced a new SCSS file to handle hover effects on rows and added the ability to remove bottom margins with a "slim" class. Updated various twig templates to utilize these new styles for better visual feedback and alignment.

src/Bundle/ChillMainBundle/Resources/public/chill/chillmain.scss

@@ -31,6 +31,8 @@
 // Specific templates
 @import './scss/notification';
 
+@import './scss/hover.scss';
+
 /*
  *    BASE LAYOUT POSITION
  */