Update weights for core, platform, and integrations guides to improve menu organization

Author: johndmulhausen

content/en/guides/core/_index.md

@@ -3,7 +3,7 @@ menu:
   default:
     identifier: core
 title: W&B Core
-weight: 5
+weight: 6
 no_list: true
 ---
 

content/en/guides/hosting/_index.md

@@ -3,7 +3,7 @@ menu:
   default:
     identifier: w-b-platform
 title: W&B Platform
-weight: 6
+weight: 7
 no_list: true
 ---
 W&B Platform is the foundational infrastructure, tooling and governance scaffolding which supports the W&B products like [Core]({{< relref "/guides/core" >}}), [Models]({{< relref "/guides/models/" >}}) and [Weave]({{< relref "/guides/weave/" >}}). 

content/en/guides/integrations/_index.md

@@ -3,7 +3,7 @@ menu:
   default:
     identifier: integrations
 title: Integrations
-weight: 9
+weight: 8
 url: guides/integrations
 cascade:
 - url: guides/integrations/:filename