As the documentation on themes for version 15 by Odoo is not up to date I want to ask the community for advice.

In a theme i am making i want to change the default 'nav-link-color'

I see it defined as

    $nav-link-color: rgba(0, 0, 0, 0.5), $font-weight: normal, $text-transform: none, 

in 

https://github.com/odoo/design-themes/blob/15.0/theme_common/static/src/scss/mixins.scss

It has now a default alpha of 0.5 and i want to change that.

What would be the recommended way to do this in my theme ?

If i look at the v15 /design-themes/ on github i only see mixins being used in 'old_snippets' folders or 'compatibility' files.