Sass variables for customising links in #front-main

The colour and text decoration of links inside `#front-main` can now
be customised via `$primary_link_*` Sass variables.

Text decoration is set in _base.scss (like global link text decoration)
while colour is handled in _layout.scss (which is where `#front-main` is
given its background colour, so likely also the time you’ll want to set
a contrasting colour for links inside it).

The colour variables are set to `null` by default, meaning that no
colour or rules for those links will be compiled, enabling the links to
inherit the global link colour style, which previously wasn’t possible.

The decoration variables are set to `underline` by default, because most
cobrands set their #front-main links to be the same colour as the
surrounding text, so adding an underline is a sensible default. You can
disable the underlines by setting `$primary_link_decoration: none` in
your cobrand’s _colours.scss file, as cheshireeast and oxfordshire do.

Fixes #3007.

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