docs: use cloudinary env variable (#3769)

* docs: use cloudinary env variable

* fix error

* added default value

* add condition for cloud name

www/docs/docusaurus.config.js

@@ -132,7 +132,7 @@ const config = {
       }
     },
     cloudinaryConfig: {
-      cloudName: 'dza7lstvk', // TODO replace with env variable
+      cloudName: process.env.CLOUDINARY_CLOUD_NAME || "",
       flags: [
         'fl_lossy',
         'f_auto'