Updates readme and workflows

.github/workflows/check_file_size.yml

@@ -1,7 +1,7 @@
 name: Check file size
 on:               # or directly `on: [push]` to run the action on every push on any branch
   pull_request:
-    branches: [master]
+    branches: [main]
 
   # to run this workflow manually from the Actions tab
   workflow_dispatch:

.github/workflows/sync_huggingface_hub.yml

@@ -1,7 +1,7 @@
 name: Sync to Hugging Face hub
 on:
   push:
-    branches: [master]
+    branches: [main]
 
   # to run this workflow manually from the Actions tab
   workflow_dispatch:

README.md

@@ -1,5 +1,3 @@
-# Grocery Classifier Demo
-
 ---
 title: Grocery Classifier Demo
 emoji: 🛒