Make links more obvious in dark theme

(cherry picked from commit 87ce2bf116de1d6a15d6f71f25eefb5814fadd9c)

Conflicts:
	src/css/bootstrap.dark.min.css
	src/css/bootstrap.light.min.css

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

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