Update docs/src/content/projects/marketing-landing-page

Co-authored-by: Simon Vrachliotis <[email protected]>

docs/src/content/projects/marketing-landing-page.mdoc

@@ -8,10 +8,10 @@ summary: >-
   CSS.
 coverImage:
   src: >-
-    https://thinkmill-labs.keystatic.net/keystatic-site/images/vey9evf79e61/better-dev-admin-ui
-  alt: Screenshot of the Keystatic Admin UI for the Better Dev Screencasts website
-  height: 1878
-  width: 2992
+    https://thinkmill-labs.keystatic.net/keystatic-site/images/qtghbagerh5w/marketing-landing-page-cover
+  alt: Screenshot of the Marketing Landing Page Keystatic demo template
+  height: 900
+  width: 1600
 sortIndex: 100
 ---
 The Marketing Landing Page demo was one of the first projects powered by Keystatic.
@@ -22,7 +22,7 @@ Before the [Keystatic CLI](https://keystatic.com/docs/quick-start) was a thing (
 
 This templates demonstrates the use of both Keystatic content types: `singletons` and `collections`:
 
-![Keystatic dashboard with singleton and collection content types](../../assets/projects/marketing-landing-page/dashboard.png)
+Missing image ../../assets/projects/marketing-landing-page/dashboard.png
 
 ## Keystatic config