docs: Update og:image dimensions to fit recommendations

Author: ntucker

docs/core/concepts/managers.md

@@ -2,7 +2,7 @@
 title: Centralized side-effect orchestration with React
 sidebar_label: Managers and Middleware
 description: Safe programmatic access to the global store. Enables fully extensible and scalable side-effects.
-image: /img/flux-full.png
+image: /img/social/managers-card.png
 ---
 
 import ThemedImage from '@theme/ThemedImage';

website/blog/2024-04-08-v0.11-queries-querable-usequery.md

@@ -2,7 +2,7 @@
 title: v0.11 Queries, Queryable, and useQuery
 authors: [ntucker]
 tags: [releases, queryable, schema]
-image: https://imgur.com/a/ajAmejK
+image: /img/social/0.11-card.png
 ---
 
 import Grid from '@site/src/components/Grid';