Update for pkgsrc README.html transition

Modernize release notes:
- use https where possible
- adapt to cdn/nycdn and our current auto-build conventions
- automate where possible
Many thanks to uwe for lots of *roff help.

catch up with current ISO naming conventions

Update path to release ISOs.

Various updates to the INSTALL notes in preparation for 5.0. Changes
are still to come.

First cut at INSTALL notes for NetBSD/arc.
Finally we could close another ancient PR port-arc/11443.

After several years, we got the native bootloader and then had
sysinst which would do apprpriate

First cut at INSTALL notes for NetBSD/arc.
Finally we could close another ancient PR port-arc/11443.

After several years, we got the native bootloader and then had
sysinst which would do apprpriate partitioning for the bootloader,
so I've noted the last difficult part, how to specify boot commands
on the ARC BIOS.

I still wonder how many possible users of NetBSD/arc are there
who will need this topic though... ;-p

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