website: Convert Makefile to build-html.sh shell script

Signed-off-by: Jordan Justen's avatarJordan Justen <jordan.l.justen@intel.com>
Acked-by: Eric Anholt's avatarEric Anholt <eric@anholt.net>
Acked-by: Dylan Baker's avatarDylan Baker <dylan@pnwbakers.com>
parent 74bc6634
Pipeline #14253 passed with stages
in 31 seconds