fix: change SSH to HTTPS clone in Readme (#1411)

Using `git clone [email protected]...` notation may lead to an error `Permission denied (publickey) fatal: Could not read from remote repository.` if a user doesn't have a public SSH key stored in their github account. Using `git clone https://` is a 100% error-free solution (it doesn't require any SSH keys).

Author: Vadim Vinogradov

README.md

@@ -11,7 +11,7 @@
 1. リポジトリをクローンします
 
 ```bash
-git clone git@github.com:vuejs-jp/ja.vuejs.org.git
+git clone https://github.com/vuejs-jp/ja.vuejs.org.git
 ```
 
 2. 依存ファイルをインストールします