chore: add logo and marketplace icon

Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca>

Author: SebTardif

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="images/banner.png" alt="Patchloom for VS Code" width="640">
+  <img src="images/logo-512.png" alt="Patchloom logo" width="200">
 </p>
 
 # Patchloom for VS Code

images/icon-128.png

@@ -17,9 +17,9 @@
     "vscode": "^1.90.0",
     "node": ">=20"
   },
-  "icon": "images/icon.png",
+  "icon": "images/logo-512.png",
   "galleryBanner": {
-    "color": "#1e1e2e",
+    "color": "#0d1b2a",
     "theme": "dark"
   },
   "categories": [