Merge branch 'develop' of github.com:tracim/tracim_frontend into develop

src/css/Generic.styl

   min-height calc(100% - 50px)
 
 .pageWrapperGeneric
-  width 100%
+  width calc(100% - 300px) // 300px => width of the sidebar
   &__header
     display flex
   &__content

src/css/Sidebar.styl

   position absolute
   left 0
   display none
-  border 1px solid darkBlue
+  border 1px solid thirdColor
   border-top-width 2px
   padding 11px 15px
   background-color blue