fix(a11y): fix contrast ratio of content links

RTD theme uses #2980b9 for links, which gives ~4.3:1 against white.
WCAG AA / BITV 9.1.4.3 requires 4.5:1 for normal-weight text.

Override to #2474a4 (~5.1:1) in the content area only, so it does
not affect sidebar or header links that sit on coloured backgrounds.

Fixes #9674

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

Author: skjnldsv

_shared_assets/static/custom.css

@@ -17,6 +17,14 @@ h6 {
 	background-color: #0082c9;
 }
 
+/* Content links — RTD default #2980b9 gives ~4.3:1 against white,
+   below the 4.5:1 required by WCAG AA / BITV 9.1.4.1 and 9.1.4.3.
+   #2474a4 yields ~5.1:1 while keeping the same blue visual style. */
+.rst-content a,
+.rst-content a:visited {
+	color: #2474a4;
+}
+
 /* Reduce size of logo in top left */
 .wy-side-nav-search > a img.logo {
 	max-width: 180px;