Make links visible in light mode (#1315)

## Description

Use specific color for light mode links to make them stand out

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

## Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->

## Test Plan

<!-- How will this be tested prior to merging.-->
- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

docs/src/css/custom.scss

@@ -18,6 +18,10 @@
   --docusaurus-highlighted-code-line-bg: rgba(0, 0, 0, 0.1);
 }
 
+[data-theme='light'] {
+  --ifm-link-color: #087EA4;
+}
+
 /* For readability concerns, you should choose a lighter palette in dark mode. */
 [data-theme='dark'] {
   --ifm-color-primary: #cdd4f9;
@@ -32,6 +36,7 @@
 
 html[data-theme='dark'] {
   --ifm-background-color: #111629;
+  --ifm-link-color: #087EA4;
 }
 
 .navbar {