feat: Initial authentication logic and UX

wp-content/themes/moonshine/app/graphql/AuthLogin.mutation.gql

@@ -0,0 +1,19 @@
+fragment AuthUser on User {
+	id
+	email
+	roles {
+		nodes {
+			name
+		}
+	}
+}
+
+mutation AuthLogin($username: String!, $password: String!) {
+login( input: { provider: PASSWORD, credentials: { username: $username, password: $password }}) {
+    authToken
+    refreshToken
+    user {
+      ...AuthUser
+    }
+  }
+}

wp-content/themes/moonshine/app/graphql/AuthRefreshToken.mutation.gql

@@ -0,0 +1,5 @@
+mutation AuthRefreshToken($refreshToken: String!) {
+	refreshToken( input: { refreshToken: $refreshToken }) {
+		authToken
+	}
+}