Upgrade Nutanix extension to 1.0.1

- fix Nutanix logo
- add proper description

manifest.json

@@ -20,7 +20,8 @@
       "repo": "nutanix-cloud-native/nutanix-rancher-extension",
       "branch": "gh-pages",
       "versions": [
-        "1.0.0"
+        "1.0.0",
+        "1.0.1"
       ]
     }
   }