Mostly put's GitHub's link color to back to how it was before 03.01.2017, i.e. not stabbing your eyes. Credit to https://userstyles.org/styles/139584/github-return-link-color. Load using a Chrome extension like Stylebot.

link.css

[role="main"] a:not(.btn):not(.social-count):not(.reponav-item):not(.muted-link):not(.commit-tease-sha):not([data-pjax]):not(.user-mention), 
[role="main"] .btn-link, 
[role="main"] .numbers-summary a:hover, 
[role="main"] table.files td.message a:hover,
[role="main"] .notifications .notifications-more > a {
  color: #4078c0;
}
  
[role="main"] table.files td.icon .octicon-file-directory {
  color: #80a6cd;
}