feat: Add initial setup page and functionality for admin account creation

- Created setup.html for the initial configuration of the admin account.
- Implemented setup.js to handle form submission and validation.
- Added logo images for branding.
- Introduced storage.js for API data handling (load, save, remove).
- Added styles.css for consistent styling across the application.

.gitignore

@@ -0,0 +1,15 @@
+# Dependencies
+/node_modules
+
+# Local Database
+ap-pos.db
+
+# Environment variables
+.env
+*.env.local
+*.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*