add global styles for links to temporarily fix the md links styles

Author: pettinarip

src/@chakra-ui/gatsby-plugin/styles.ts

@@ -19,6 +19,10 @@ const styles = {
       bg: mode("white", "gray.700")(props),
       lineHeight: "1.6rem",
     },
+    a: {
+      color: "primary",
+      textDecoration: "underline",
+    },
     // should be replace with https://chakra-ui.com/docs/components/text
     p: {
       margin: "0px 0px 1.45rem",