fix(docs): stretched icon button will interfere with ripple

As there is the icon button in the toolbar currently stretched, the ripple isn't working anymore.
This can be fixed by removing that stretching.
- Everything will work still the same, except the button won't be moved `8px` right (but that still looks fine)

Line introduced in bd9bbdb#diff-272b77251b74dd4fbf020ac40c529c11R396

  Closes #7227

docs/app/css/style.css

@@ -431,10 +431,6 @@ a.docs-logo {
   margin: 0 24px;
   width: auto;
 }
-.docs-tools .md-button {
-  padding: 0;
-  margin: 0 0 0 8px;
-}
 .docs-tools .md-button,
 .docs-tools .md-button md-icon {
   color: #666 !important;