feat: update composer details and add logo

Signed-off-by: ItsNeil17 <neil@willofsteel.me>

Author: ItsNeil17

composer.json

@@ -14,6 +14,11 @@
             "name": "Ben Cressman",
             "email": "ben@hytalemodding.dev",
             "role": "Developer"
+        },
+        {
+            "name": "Neil Revin",
+            "email": "neil@hytalemodding.dev",
+            "role": "Developer"
         }
     ],
     "autoload": {
@@ -23,12 +28,10 @@
     },
     "extra": {
         "flarum-extension": {
-            "title": "Theme",
-            "category": "",
+            "title": "HytaleModding Theme",
+            "category": "theme",
             "icon": {
-                "name": "",
-                "color": "",
-                "backgroundColor": ""
+                "image": "logo.png"
             }
         },
         "flarum-cli": {