fix: update avatar post image path to .jpeg in index.json

Author: furqanrydhan

posts/index.json

@@ -28,7 +28,7 @@
     "file": "2026-02-17-improved-agent-avatar-display.md",
     "title": "Improved Agent Avatar Display",
     "date": "2026-02-17T16:00:00.000Z",
-    "image": "images/improved-agent-avatar-display.png",
+    "image": "images/improved-agent-avatar-display.jpeg",
     "excerpt": "Fixed agent avatar rendering in chat messages for a more consistent and polished experience across all agent types.",
     "tags": [
       "changelog",
@@ -77,34 +77,10 @@
     "title": "Smarter Error Messages & Image Handling",
     "date": "2026-02-17T08:05:21.000Z",
     "image": "images/smarter-error-messages-image-handling.jpeg",
-    "excerpt": "Two quality-of-life improvements ship today that make Nebula's mobile experience noticeably smoother.",
+    "excerpt": "Error messages now show actionable details instead of raw codes, and images are handled more reliably across the platform.",
     "tags": [
       "changelog",
       "improvement"
     ]
-  },
-  {
-    "slug": "customizable-app-themes",
-    "file": "2026-02-17-customizable-app-themes.md",
-    "title": "Customizable App Themes",
-    "date": "2026-02-17T08:05:16.000Z",
-    "image": "images/customizable-app-themes.png",
-    "excerpt": "The Nebula mobile app now lets you personalize your experience with a brand-new Appearance screen.",
-    "tags": [
-      "changelog",
-      "feature"
-    ]
-  },
-  {
-    "slug": "smoother-mobile-chat",
-    "file": "2026-02-17-smoother-mobile-chat.md",
-    "title": "Smoother Mobile Chat",
-    "date": "2026-02-17T08:05:11.000Z",
-    "image": "images/smoother-mobile-chat.jpeg",
-    "excerpt": "We've rebuilt how the Nebula mobile app handles real-time messaging, making conversations noticeably more responsive.",
-    "tags": [
-      "changelog",
-      "feature"
-    ]
   }
 ]