Docs: switch links to a subtler color

Red hurts text readability when it occurs inline

Swift SVN r25303

Author: Dave Abrahams

Diff for: docs/conf.py

@@ -99,7 +99,12 @@
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#html_theme_options = {}
+html_theme_options = {
+  # Red links are a bit too garish
+  "linkcolor" : "#577492",
+  "visitedlinkcolor" : "#577492",
+  "hoverlinkcolor" : "#551A8B"
+}
 
 # Add any paths that contain custom themes here, relative to this directory.
 html_theme_path = ["."]