Adding green overleaf logo in navbar and footer for website redesign (#28508)

* adding overleaf-green logo in navbar

* adding overleaf green in footer

GitOrigin-RevId: de8c8a280ee5611a37a6cfa3d710ada1815506e5

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

@@ -457,7 +457,7 @@ footer.site-footer {
   }
 
   .footer-brand {
-    background-image: url('../../../public/img/ol-brand/overleaf-black.svg');
+    background-image: url('../../../frontend/js/shared/svgs/overleaf-green.svg');
   }
 
   @include footer-container-down(sm) {

services/web/frontend/stylesheets/components/navbar.scss

@@ -223,7 +223,7 @@
   --navbar-title-color-hover: var(--content-secondary);
   --navbar-brand-image-url: var(
     --navbar-brand-image-redesign-url,
-    url('../../../public/img/ol-brand/overleaf-black.svg')
+    url('../../../frontend/js/shared/svgs/overleaf-green.svg')
   );
   --navbar-subdued-color: var(--content-primary);
   --navbar-subdued-hover-bg: var(--bg-dark-primary);