Make tables breathe a bit more

wiki/src/local.css

@@ -82,10 +82,14 @@ body {
 
 /* The bottom margin of all elements is fixed to a multiple of λ so that they
  * don't brake the rythm when they overlap. We set all top margin to 0. */
-p, table {
+p {
     margin: 0 0 1.5em 0; /* 14×1.5=21px=λ */
 }
 
+table {
+    margin: 1.5em 0;
+}
+
 h1, h2, h3, .sidebar {
     font-family: "Source Sans Pro Regular", "DejaVu Sans", "Verdana", sans-serif;
     font-weight: normal;