Feat/dynamic banner updates

[sebastianscatularo]

Banners can be defined at: data/banners.json

[
    {
        "id": "string",
        "background":"red",
        "content": "a red banner",
        "since": "2023-12-22T01:06:52.211Z",
        "until": "2023-12-23T01:06:52.211Z"
    },
    {
        "id": "string",
        "background":"yellow",
        "content": "<h1 color=\"black\" style=\"color: black;\">expired yellow banner</h1>",
        "since": "2023-12-22T01:06:52.211Z",
        "until": "2023-12-22T01:06:52.211Z"
    },
    {
        "id": "string",
        "background":"yellow",
        "content": "<h1 color=\"black\" style=\"color: black;\">a yellow banner</h1>",
        "since": "2023-12-22T01:06:52.211Z",
        "until": "2023-12-23T01:06:52.211Z"
    }
]```