[Glitch] Rename JSX files with proper .jsx extension

Port 44a7d87cb1 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/components/logo.jsx

@@ -0,0 +1,10 @@
+import React from 'react';
+
+const Logo = () => (
+  <svg viewBox='0 0 261 66' className='logo' role='img'>
+    <title>Mastodon</title>
+    <use xlinkHref='#logo-symbol-wordmark' />
+  </svg>
+);
+
+export default Logo;