Docs: rewrite README with clear Docker and Docker Compose instructions; refactor app into package (auth, admin, pages, db); keep single entrypoint app.py

app/__init__.py

@@ -0,0 +1,34 @@
+import os
+from flask import Flask
+
+from . import db
+from .auth import auth_bp
+from .admin import admin_bp
+from .pages import pages_bp
+
+
+def create_app() -> Flask:
+    app = Flask(__name__)
+
+    # Basic config
+    app.config["SECRET_KEY"] = os.environ.get(
+        "SECRET_KEY",
+        "dev-secret-change-me",
+    )
+    app.config["DATABASE"] = os.environ.get(
+        "DATABASE",
+        os.path.join(os.path.dirname(os.path.dirname(__file__)), "app.db"),
+    )
+    app.config["ADMIN_USERNAME"] = os.environ.get("ADMIN_USERNAME", "ruslan")
+    app.config["ADMIN_PASSWORD"] = os.environ.get("ADMIN_PASSWORD", "utOgbZ09ruslan")
+
+    # Init DB hooks
+    db.init_app(app)
+
+    # Register blueprints
+    app.register_blueprint(auth_bp)
+    app.register_blueprint(admin_bp)
+    app.register_blueprint(pages_bp)
+
+    return app
+