add accent color option

assets/sass/_theme/_configuration.sass

@@ -505,6 +505,7 @@ $organization-background-color: $color-background-alt !default // Use sass varia
 $project-infos-border-color: $color-border !default
 $project-infos-color-text: $color-text !default
 $project-infos-color-text-alt: $color-text-alt !default
+$project-infos-color-accent: $color-accent !default
 
 // Program
 $program-essential-font-size: $meta-size !default

assets/sass/_theme/sections/projects.sass

@@ -18,6 +18,7 @@
             --color-border: #{$project-infos-border-color}
             --color-text: #{$project-infos-color-text}
             --color-text-alt: #{$project-infos-color-text-alt}
+            --color-accent: #{$project-infos-color-accent}
     @include media-breakpoint-up(sm)
         .hero
             .project-infos