Add rule to inherit the global footer link color from the navigation …

…container (#215)

Gutenberg 13.6.0 has removed this inheritance causing the links to change from white to blue, and greatly effecting the accessibility of the menu links due to low color contrast.
This commit is intended to be a quick fix until we can make changes to Gutenberg.

mu-plugins/blocks/global-header-footer/postcss/footer/footer.pcss

@@ -27,4 +27,8 @@
 			font-size: var(--wp--preset--font-size--small);
 		}
 	}
+
+	& .wp-block-navigation-item .wp-block-navigation-item__content {
+		color: inherit;
+	}
 }