Remove reference to netlify (#550)

now powered:
- by cloudflare pages for PR previews, and
- by AWS S3/cloudfront for apex domain.

Author: blckmn

src/theme/Footer/Layout/index.js

@@ -10,9 +10,6 @@ export default function FooterLayout({ style, links, logo, copyright }) {
           <Logo className="invertable w-36 h-36 mr-12 mt-4 inline-block opacity-10"></Logo>
           {copyright}
           <div className="mt-1 text-sm text-neutral-500/60">Built with Docusaurus</div>
-          <a className="mt-1 text-sm text-neutral-500/60 font-bold hover:text-teal-500 no-underline duration-300" href="https://www.netlify.com">
-            This site is powered by Netlify
-          </a>
           <div className="mt-1 text-sm text-neutral-500/60">
             made with <span className="text-red-500">❤️</span> by{' '}
             <a className="font-bold hover:text-emerald-500 no-underline duration-300" href="https://github.com/vitroidfpv">