Get rid of the use of `.ini` files

It would be simpler if the user could just define all settings in a python file.

```
botconf
    - __init__.py
    - secrets.py
```

```py
# __init__.py

import secrets

COMMAND_PREFIX = "!"
GREETINGS = "hello|hi|hey"

COMMANDS = {
    "help": { type: "static", content: "..." },
    "echo": { type: "dynamic", function: command_echo }
}

def command_echo():
    ...
```