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/components/Group/GroupSection.vue

@@ -32,8 +32,6 @@ export default class GroupSection extends Vue {
 }
 </script>
 <style lang="scss" scoped>
-@import "@/variables.scss";
-
 section {
   display: flex;
   flex-direction: column;