fix: mention yarn and node install in README

Signed-off-by: Terry Howe <[email protected]>

Author: TerryHowe

README-ko.md

@@ -9,7 +9,7 @@
 Helm.sh는 사용자 지정 테마를 사용하여 구축된 간단한 [휴고(Hugo)](https://gohugo.io/) 정적 사이트입니다. 웹 사이트를 로컬에서 실행하려면 먼저 휴고와 이와 관련된 모듈(dependencies)을 [설치](https://gohugo.io/getting-started)해야 합니다.
 
 ```
-brew install hugo
+brew install hugo yarn node
 yarn install
 ```
 

README.md

@@ -9,7 +9,7 @@ This is where you'll find all of the assets that make up [helm.sh](https://helm.
 Helm.sh is a simple [Hugo](https://gohugo.io/) static site, built with a custom theme. To run the website locally, you'll need to first [install](https://gohugo.io/getting-started) Hugo extended edition and any dependencies.
 
 ```
-brew install hugo
+brew install hugo yarn node
 yarn install
 ```