Added Image deletion

Added buttons for image functions
Moved Image functions to their own file
Added PFP row in users table
Moved Groups back to the root templates folder

gallery/schema.sql

@@ -1,6 +1,7 @@
 CREATE TABLE IF NOT EXISTS users (
     id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
     username TEXT NOT NULL UNIQUE,
+    profile_picture TEXT NOT NULL DEFAULT 'default.png',
     email TEXT NOT NULL,
     password TEXT NOT NULL,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP