Improve build times

* Fix bulma/buefy being imported many (many !!!) times

* Remove javascript-time-ago because date-fns pretty much does the same
thing

* Make sure languages are loaded asynchronously

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/common.scss

@@ -1,5 +1,9 @@
 @import "variables.scss";
 
+@import "~bulma";
+@import "~bulma-divider";
+@import "~buefy/src/scss/buefy";
+
 // a {
 //   color: $violet-2;
 // }