https://github.com/tracim/tracim/issues/803, https://github.com/tracim/tracim/issues/802, fix the margin of dashboard, fix the scroll on member list and recent activity on dasboard

frontend/src/component/Dashboard/MemberList.styl

 @import "../../../node_modules/tracim_frontend_lib/src/css/Variable.styl"
 
 .memberlist
-  margin 0 0 50px 0
-  width 35%
+  margin 0 0 50px 10px
+  width 37%
   &__title
     margin-bottom 20px
     padding 6px
   &__wrapper
     position relative
     border 1px solid grey
-    height 480px
+    min-height 480px
   &__list
     margin 0
     padding 0
     list-style none
     height 400px
-    overflow-Y scroll
     &__item
       display flex
       border-bottom 1px solid grey

frontend/src/component/Dashboard/RecentActivity.styl

   width 60%
   &__wrapper
     border 1px solid grey
-    height 480px
-    overflow-y scroll
+    min-height 480px
   &__header
     display flex
     justify-content space-between