chore(docs): add favicon base url

Author: Pyrax

www/src/content/docs/index.mdx

@@ -7,7 +7,7 @@ import { Aside, Tabs, TabItem } from '@astrojs/starlight/components'
 
 <center>
 
-<img src="favicon.png" alt="react-netlify-forms" style={{ maxHeight: '120px' }} />
+<img src="/react-netlify-forms/favicon.png" alt="react-netlify-forms" style={{ maxHeight: '120px' }} />
 
 React components and hooks giving you the power of Netlify Forms. Start building serverless forms on Netlify with React. Honeypot fields and reCAPTCHA are included as ready-to-use components.