Add Disqus comment system integration

COMMENTS_SETUP.md

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+# Comments Configuration
+
+This blog now supports comments via Disqus. To enable comments on your blog posts, follow these steps:
+
+## Setting up Disqus Comments
+
+1. **Create a Disqus Account**
+   - Go to [https://disqus.com/](https://disqus.com/)
+   - Click "Get Started" and create an account
+   - Choose "I want to install Disqus on my site"
+
+2. **Register Your Site**
+   - Enter your website name
+   - Choose a unique Disqus shortname (e.g., `my-awesome-blog`)
+   - Select a category for your site
+   - Complete the registration process
+
+3. **Configure Your Blog**
+   - Open `src/consts.ts` in your project
+   - Find the `comments` section in `SITE_METADATA`
+   - Update the configuration:
+
+   ```typescript
+   comments: {
+     provider: 'disqus',  // Change from '' to 'disqus'
+     disqusConfig: {
+       shortname: 'your-disqus-shortname',  // Add your shortname here
+     },
+   },
+   ```
+
+4. **Build and Deploy**
+   - Run `npm run build` to build your site
+   - Deploy your updated site
+   - Comments will now appear at the bottom of each blog post
+
+## Features
+
+- Comments appear on both post layouts (standard and simple)
+- A "Scroll to Comment" button appears in the bottom-right corner when scrolling
+- Comments section includes the standard Disqus features:
+  - User authentication via multiple providers
+  - Moderation tools
+  - Reaction buttons
+  - Threading and replies
+  - Email notifications
+
+## Customization
+
+The comments section styling can be customized in `src/components/Comments.astro`. The Disqus component itself is located in `src/components/solidjs/Disqus.tsx`.
+
+## Troubleshooting
+
+- **Comments not showing**: Make sure you've set the `provider` to `'disqus'` and added your `shortname`
+- **Wrong site configuration**: Double-check your shortname matches exactly what you registered with Disqus
+- **Development vs Production**: Disqus may behave differently in development mode. Test on your deployed site for full functionality