enhance: description for (1) Add deploy Key

Author: peaceiris

README.md

@@ -18,12 +18,20 @@ A GitHub Action to deploy your static site to GitHub Pages with [Static Site Gen
 
 ### (1) Add deploy Key
 
-1. Generate deploy key `ssh-keygen -t rsa -b 4096 -C "[email protected]" -f gh-pages -N ""`
-    - You will get 2 files: `gh-pages.pub` (public key) and `gh-pages` (private key)
-2. Go to "Settings > Deploy Keys" of repository.
-3. Add your public key within "Allow write access" option.
-4. Go to "Settings > Secrets" of repository.
-5. Add your private key as `ACTIONS_DEPLOY_KEY`
+Generate deploy key with the following command.
+
+```sh
+ssh-keygen -t rsa -b 4096 -C "[email protected]" -f gh-pages -N ""
+
+# You will get 2 files:
+#   gh-pages.pub (public key)
+#   gh-pages     (private key)
+```
+
+Next, Go to **Repository Settings**
+
+- Go to **Deploy Keys** and add your public key with the "Allow write access"
+- Go to **Secrets** and add your private key as `ACTIONS_DEPLOY_KEY`
 
 ### (2) Create `main.workflow`