[v2] Remove `hide` configurations

[luizdepra]

These hide configurations are a kind of customization that are easily achieved by overriding one or two files. These features turn our templates really messy. Look how monstrous is the partials/footer.html template, and it just renders a simple footer section.

So lets remove these configurations and fix all related files:

• hideFooter
• hideCredits
• hideCopyright
• hideColorSchemeToggle (we still need to keep hiding the toggle when the color scheme is set to auto)

[luizdepra]

We removed footerContent for the same motive.

But we still need to remove hideColorSchemeToggle.

[0xMH]

Can you please explain how to hide Copyright and Footer now that the option is removed?

[luizdepra]

@0xMH, now you need to override the footer template.

[peterder72]

These shall also be removed from all READMEs as they're still in the example configuration manual. Is someone already on that or shall I fix it?

[luizdepra]

If there are any mentions of it in the repository, I would appreciate your help. The wiki page, I'm going to fix it now.