[FIX] website: use automatic color for transparent navbars

When enabling a transparent navbar on a specific page, the user can then
choose a bg color (class) to apply on the transparent navbar. That class
comes with an automatic text color... which was not correctly working
because BS4 overrides colors for nav-links.

Part of https://github.com/odoo/odoo/pull/45351
task-2151408

closes odoo/odoo#47896

X-original-commit: 2937358b63c23bd7e34da713ab4236fa340be0a9
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website/static/src/scss/website.scss

@@ -744,16 +744,15 @@ table.table_desc tr td {
         > .navbar {
             background-color: transparent !important;
             border-color: transparent;
+            color: inherit;
 
             .nav-item {
                 > .nav-link {
                     background-color: transparent;
                     color: inherit;
-                }
-                &.show, &.active {
-                    > .nav-link {
-                        background-color: white;
-                        color: black;
+
+                    &.active {
+                        font-weight: bolder;
                     }
                 }
             }