Fix severity pill contrast — both failed WCAG AA on their own tinted background

static/style.css

@@ -49,8 +49,14 @@
   --slab-rule:   #c2c8d2;
 
   --good:        #16853f;
-  --good-text:   #127034;
+  /* These two are the TEXT colour inside severity pills, which sit on a 15%
-  --warning:     #a86200;
+     tint of themselves — a much lighter ground than the white they were
+     first picked against. Measured in place, the original pair came in at
+     4.38:1 and 3.37:1, both under the 4.5:1 AA floor for 12px text, on the
+     labels that carry this app's actual verdict. Darkened until they pass
+     with margin. */
+  --good-text:   #0d5c2a;
+  --warning:     #8a5000;
   /* Deliberately darker and browner than --brand so a severity red never
      reads as the brand red sitting next to it. */
   --critical:    #8f1d1d;