DietPi-Banner | Add option to disable credits

[math-gout]

The credits part of dietpi-banner takes a lot of space, so I added an option to disable it.
I know that they are important so they are enabled by default.

[MichaIng]

Many thanks for your PR.

We intentionally did not add this toggle to always keep honour for all kinds of project contributors. But I understand that it takes a significant part of the login screen and when seen once, it may not be important to force it being shown on every login again. I add the team for reviewing for a decision on this.

[Joulinar]

@MichaIng
let's have a chat on our next project meeting to discuss about.

[MichaIng]

I was just about to edit something into my post, you are too fast 😄. Good idea. However let me still add this:

The only thing that may change is the Patreon Legends, but if we would like to assure that they are given credits among all users, we could also reset the setting on update, if a new Patreon Legend joined, or we can add this to the changelog (I think we did in the past), show an additional prompt as part of the patches or similar, even depending on whether credits are enabled in the banner or not.