Fix broken docs link

[hexbin]

https://docs.cloudron.io/apps/hedgedoc/

Section Custom configuration, "Link in See HedgeDoc docs for configuration options reference" responds with 404.

I guess this would be the new location: https://docs.hedgedoc.org/configuration/

[nebulon]

@hexbin thanks for the hint, this is fixed now.

[hqlsolutions]

The link for HedgeDoc configuration options in the Cloudron docs is broken. You can find the updated information at HedgeDoc Configuration Documentation.

[nebulon]

I think I am blind here, but which one of the links at https://docs.cloudron.io/apps/hedgedoc/ is not working? Then I will fix it.