Change link color to full blue

This is mostly to have better contrast with the alternative row color
(#EDE95E), because with Firefox’s default link color (#1B6ACB), on Linux
at least, the contrast ratio is 4,5:1.

Closes #62.

web/static/numerus.css

@@ -194,6 +194,10 @@ p, h1, h2, h3, h4, h5, h6 {
     overflow-wrap: break-word;
 }
 
+:any-link {
+    color: #0000ff;
+}
+
 input[type="radio"] {
     accent-color: var(--numerus--color--black);
 }