clarfiy homepage sign-in is only for admins

Author: wmurphyrd

src/react-components/home/SignInButton.js

@@ -6,8 +6,8 @@ import { Button } from "../input/Button";
 
 export function SignInButton({ mobile }) {
   return (
-    <Button className={mobile ? styles.mobileSignIn : styles.SignInButton} thick preset="signin" as="a" href="/signin">
-      <FormattedMessage id="sign-in-button" defaultMessage="Sign in/Sign up" />
+    <Button className={mobile ? styles.mobileSignIn : styles.SignInButton} sm preset="basic" as="a" href="/signin">
+      <FormattedMessage id="sign-in-button" defaultMessage="Admin sign in" />
     </Button>
   );
 }

src/react-components/home/SignInButton.scss

@@ -8,6 +8,7 @@
 }
 
 :local(.mobile-sign-in) {
+    z-index: 5; /* prevent menu header from blocking button */
     display: flex;
     @media(min-width: theme.$breakpoint-lg) {
         display: none;

src/react-components/layout/Header.scss

@@ -94,7 +94,7 @@ header {
 
   a {
     margin-left: 8px;
-    color: theme.$link-color;
+    // color: theme.$link-color;
   }
 
   @media(min-width: theme.$breakpoint-lg) {