fix(website): Make the link to ORT readable

Do not use the same link color as for the background. This is a fixup
for fe561a7. Also see [1].

[1]: oss-review-toolkit/ort#9718

Signed-off-by: Sebastian Schuberth <[email protected]>

Author: sschuberth

website/src/pages/index.module.css

@@ -10,6 +10,11 @@
   overflow: hidden;
 }
 
+.heroBanner a {
+  color: var(--ifm-hero-text-color);
+  font-weight: bold;
+}
+
 .heroLogo {
   width: 300px;
   height: auto;