Customized link, text, navbar color in bootstrap.

For better contrast:
@textColor: black

Webwork header's background color makes a nice link colour:
@linkColor: #038
Use the default bootstrap blue for hover:
@linkColorHover: #08c

In case we want to build the header with bootstrap's navbar:
@navbarBackground: #038
@navbarBackgroundHighlight: #038

Instead of gray text colour, use white for better contrast
@navbarText: white
@navbarBrandColor: white
@navbarLinkColor: white
@navbarLinkColorHover: white

Since the text no longer change colour on hover, we need to change the
background to indicate a hover. Use bootstrap's default blue.
@navbarLinkBackgroundHover: #08c