Bug#960835: Debian Jessie site lists only 4 archs as supported

Hi

Thanks Holger for caring about this issue.
A related problem with jessie is that we have 8.11.0 images for all the
arches, but 8.11.1 images only for the LTS arches.

see
https://cdimage.debian.org/cdimage/archive/8.11.0/
and
https://cdimage.debian.org/cdimage/archive/8.11.1/

So right now many links of the page
https://www.debian.org/releases/jessie/debian-installer/ provide errors.

I've had a look at your proposal and I agree (thanks!). In addition to
the changes you propose, I think we need to figure out how to show the
info in the  debian-installer page so every link works: the ones that
should point to the (unsupported) 8.11.0 images, and the ones pointing
to the 8.11.1 images.

We probably need custom tags for jessie for its arches and release_info
templates.

I'm sorry I couldn't put more time on this, for now.
Right now it's something that happens with jessie, but I guess in the
future we'll have similar issues in newer releases for which LTS only
covers part of the initial architectures.

Kind regards,