Add ability to edit or remove instructor records

[denistex]

[pavelsr]

I think there is two possible formats of storing information about who can edit or remove instructor records at bot.pl.json.

1. Add is_root flag to instructor:

{
            "first_name": "Pavel",
            "last_name": "Serikov",
            "gmail": "pavel.p.serikov@gmail.com",
            "phone_number": "+79885851900",
            "telegram_id": "@serikoff",
            "calendars": [ "Lasersaur", "Dobot"],
            "is_root": 1
        },

2. Make a separate managers: [] section because manager isn't essential instructor.

"managers": [
{
            "first_name": "Pavel",
            "last_name": "Serikov",
            "gmail": "pavel.p.serikov@gmail.com", // is gmail field needed for manager ?
            "phone_number": "+79885851900", //
            "telegram_id": "@serikoff", //
        },

However in case of using first format we can add manager as instructor with an empty calendars array.

"instructors": [
{
            "first_name": "Pavel",
            "last_name": "Serikov",
            "gmail": "pavel.p.serikov@gmail.com",
            "phone_number": "+79885851900",
            "telegram_id": "@serikoff",
            "calendars": [ ],
            "is_root": 1
        },
...
]

I think first option is better. But maybe empty calendars list may affect on code.

@denis-it, which option do you think is better?