Revert "Make links more obvious in dark theme"

This reverts commit ecf5f68c.

src/vendor/bootstrap/less/variables.dark.less

@@ -38,8 +38,8 @@
 
 // Links
 // -------------------------
-@linkColor:             @blue;
-@linkColorHover:        darken(@linkColor, 10%);
+@linkColor:             darken(@white,5%);
+@linkColorHover:        @white;
 
 
 // Typography
@@ -232,7 +232,7 @@
 
 // Form states and alerts
 // -------------------------
-@warningText:             #c09853;
+@warningText:             darken(#c09853, 10%);
 @warningBackground:       @grayLighter;
 @warningBorder:           transparent;