docs: Enable GitHub native ToC

README.md

@@ -1,4 +1,4 @@
-## GitHub Actions for GitHub Pages
+# GitHub Actions for GitHub Pages
 
 <img width="400" alt="GitHub Actions for deploying to GitHub Pages with Static Site Generators" src="./images/ogp.svg">
 
@@ -29,7 +29,7 @@ Note that the `GITHUB_TOKEN` is **NOT** a personal access token.
 A GitHub Actions runner automatically creates a `GITHUB_TOKEN` secret to authenticate in your workflow.
 So, you can start to deploy immediately without any configuration.
 
-### Supported Tokens
+## Supported Tokens
 
 Three tokens are supported.
 
@@ -43,7 +43,7 @@ Notes: Actually, the `GITHUB_TOKEN` works for deploying to GitHub Pages but it h
 For the first deployment, we need to select the `gh-pages` branch or another branch on the repository settings tab.
 See [First Deployment with `GITHUB_TOKEN`](#%EF%B8%8F-first-deployment-with-github_token)
 
-### Supported Platforms
+## Supported Platforms
 
 All Actions runners: Linux (Ubuntu), macOS, and Windows are supported.
 
@@ -57,7 +57,7 @@ All Actions runners: Linux (Ubuntu), macOS, and Windows are supported.
 
 2. WIP, See [Issue #87](https://github.com/peaceiris/actions-gh-pages/issues/87)
 
-<!-- ### GitHub Enterprise Server Support
+<!-- ## GitHub Enterprise Server Support
 
 ✅️ GitHub Enterprise Server is supported above `2.22.6`.