Feature Request: Add option to not embed, but open link

[dschier-wtd]

Currently some Options prevent the usage of external sites.
A very easy way to have at least a workaround for this, could be to have an option, which is not embedding the site, but links to it.

Steps to reproduce

https://docs.nextcloud.com/server/12/admin_manual/configuration_server/external_sites.html
Describes why some sites are not working in the bottom section.

Expected behaviour

During the creation of an external site, one should choose between "embed" and "link".
When choosing "embed" the behaviour is as known.
When choosing "link" the new link will open in a new tab or window.
Optional: links should be marked as "external" in some way.

Actual behaviour

Most sites with X-Frame-Options or Content-Security-Policy are not usable at all.
Linking to external sites seems not possible.

Server configuration

Nextcloud version: 12.0.3

[nickvergessen]

This was implemented for Nextcloud 13 already #43

[dschier-wtd]

Oh, cool. Thank a lot :)

[RHuehne]

Could there be an option to open external sites which can't be embedded in a new tab or window instead of opening the page in the current window?

[nickvergessen]

#79