Serve index on root

from collections.abc import Sequence

from flask import Flask

from flask import Flask, Response

def get_flask_app(songs: Sequence[dict[str, str]]) -> Flask:

    def get_songs() -> list[dict[str, str]]:

        return songs_list

    @app.get("/")

    def get_index() -> Response:

        return app.send_static_file("index.html")

    return app