Update documentation on how to configure which template Aliases should use in preview/edit mode

[MacLake]

When editing e. g a small footer it is confusing to see header and footer of the CMS standard table, which might belong to another section site of the CMS, and it might even be hard t find the section you want to edit, see screenshot.

[fsbraun]

@MacLake You can customize the template by providing your own alias/base.html. The one provided extends base.html, yours does not have to. Just make sure the required CSS and JS is present.

[MacLake]

Good to know, @fsbraun, actually it’s djangocms_alias/base.html (in your template folder). If you look at the code, it’s
obvious Nevertheless we should mention it in the documentation. I can do it when I have some time.