refactor: remove unused comment

Author: mxschll

src/container/styles.scss

@@ -12,10 +12,6 @@
   word-wrap: break-word;
   position: relative;
 
-  // Necessary, because rounded borders cause the header to overflow. Since the
-  // header has a background color, the edges of the header stick out.
-  // overflow: hidden;
-
   &.fit-height {
     display: flex;
     flex-direction: column;