docs: add upgrade guide for 1.3.8 (#2170)

* add upgrade guide for 1.3.8

* added to sidebar

* added announcement bar

www/docs/docusaurus.config.js

@@ -32,6 +32,14 @@ module.exports = {
     ]
   ],
   themeConfig: {
+    announcementBar: {
+      id: 'release-1-3-8',
+      content:
+        'New Release! Version 1.3.8 of Medusa is out now! Read all about it <a href="https://github.com/medusajs/medusa/releases/tag/v1.3.8">here</a>.',
+      backgroundColor: '#7C53FF',
+      textColor: '#fff',
+      isCloseable: false,
+    },
     colorMode: {
       defaultMode: 'light',
       disableSwitch: false,

www/docs/sidebars.js

@@ -169,6 +169,11 @@ module.exports = {
               id: "advanced/backend/upgrade-guides/1-3-6",
               label: "v1.3.6"
             },
+            {
+              type: "doc",
+              id: "advanced/backend/upgrade-guides/1-3-8",
+              label: "v1.3.8"
+            },
           ]
         },
       ]