[arch-projects] [archweb] [RFCv2] Add releng netboot to archweb

This is the second WIP patch series to add the netboot environment to archweb. I improved a few minor issues compared to the last version. - I have no idea if django properly caches this page, or if this requires extra configuration, as regenerating it every time seems like overkill. - All files that iPXE needs to access must be served without SSL as far as I know. To test it, set your archweb test environment to run on http://localhost:8000/ Download ipxe.lkrn from https://paste.xinu.at/OX7oU8/ and execute qemu-system-x86_64 -enable-kvm -kernel bin/ipxe.lkrn or qemu-system-x86_64 -enable-kvm -kernel bin/ipxe.lkrn -cpu kvm32 (I hope this still works, cannot test right now)