Update oss footer logo (#387)

Summary:
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- Fixed oss footer logo
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Pull Request resolved: #387

Test Plan:
Before:
<img width="1440" alt="Captura de pantalla 2022-12-16 a las 19 11 31" src="https://user-images.githubusercontent.com/4989177/208162082-150f15a6-6ebd-4f7a-8303-fa158c3c04cf.png">
After:
<img width="1440" alt="Captura de pantalla 2022-12-16 a las 19 12 03" src="https://user-images.githubusercontent.com/4989177/208162155-7520bbbb-9e3a-4a3f-ab9b-a36864b16f0b.png">

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Differential Revision: D42104872

Pulled By: lacbs

fbshipit-source-id: 9098caec8ccdd4d20edad63714bcaee9e74d6aef

website/docusaurus.config.js

@@ -57,7 +57,7 @@ module.exports = {
       style: 'dark',
       logo: {
         alt: 'Facebook Open Source Logo',
-        src: 'https://docusaurus.io/img/oss_logo.png',
+        src: 'img/oss_logo.png',
         href: 'https://opensource.facebook.com/',
       },
       copyright: `Copyright © ${new Date().getFullYear()} Facebook, Inc.`,