Fix minio docs (#901)

* Add minio links to sidebar

* Minio plugin page

* Fixed some typos

www/docs/sidebars.js

@@ -95,6 +95,10 @@ module.exports = {
           type: "doc",
           id: "how-to/uploading-images-to-s3",
         },
+        {
+          type: "doc",
+          id: "how-to/uploading-images-to-minio",
+        },
       ],
     },
     {
@@ -158,6 +162,11 @@ module.exports = {
           id: "add-plugins/s3",
           label: "File: S3",
         },
+        {
+          type: "doc",
+          id: "add-plugins/minio",
+          label: "File: MinIO",
+        },
         {
           type: "doc",
           id: "add-plugins/stripe",