docs: add fr to available locales

Author: n0mad-d3v

docusaurus.config.js

@@ -40,7 +40,7 @@ const config = {
   // to replace "en" with "zh-Hans".
   i18n: {
     defaultLocale: 'en',
-    locales: ['en', 'es'],
+    locales: ['en', 'es', 'fr'],
     localeConfigs: {
       en: { label: 'English' },
       es: { label: 'Español' },