Allow setting in WebUI to change or remove password

[nigiriemoji]

Hey I love dietpi-dashboard on Pi 4 4gb.

I know I can change or remove password by running

sudo nano /opt/dietpi-dashboard/config.toml

But can you please put a settings option to be able to change this easier? Thank you

[C-Fu]

In the meantime, how would one regenerate the hash and secret if we've changed our dietpi root password?

[nonnorm]

There are instructions in the config file:

# To get hash: "echo -n '<PASSWORD>' | sha512sum
# To get random secret: "openssl rand -hex 32"