feat: adding dark mode footer (#30772)

* feat: adding dark mode footer

* Update services/web/frontend/stylesheets/components/footer.scss

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* feat: update linkedin logo to correct color, and enforce specific colors on socials logos

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
GitOrigin-RevId: 841317846dfbee04c1a00565054d7e9428805796

services/web/frontend/js/shared/svgs/linkedin-logo.tsx

@@ -4,7 +4,7 @@ function LinkedInLogo() {
       <g fill="none" fillRule="evenodd">
         <path
           className="background"
-          fill="#0B66C3"
+          fill="#2867b2"
           d="M8 72h56a8 8 0 0 0 8-8V8a8 8 0 0 0-8-8H8a8 8 0 0 0-8 8v56a8 8 0 0 0 8 8"
         />
         <path