Rename Flask template app to pbpl

Signed-off-by: Arija A. <ari@ari.lt>

src/pbpl/db.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""Flask Database"""
+
+from typing import Tuple
+
+from flask_migrate import Migrate  # type: ignore
+from flask_sqlalchemy import SQLAlchemy  # type: ignore
+
+__all__: Tuple[str, str] = (
+    "db",
+    "migrate",
+)
+
+db: SQLAlchemy = SQLAlchemy()
+migrate: Migrate = Migrate()