rewrites.conf for apache is empty. Suggested rewrites:

<VirtualHost *:80>

....host config....

RewriteEngine on
RewriteRule ^/merged/pool/DEVUAN/(.*)$ http://packages.devuan.org/devuan/devuan/pool/$1 [R,L]
RewriteRule ^/merged/pool/DEBIAN-SECURITY/(.*)$ http://security.debian.org/pool/$1 [R,L]
RewriteRule ^/merged/pool/DEBIAN/(.*)$ http://httpredir.debian.org/debian/pool/$1 [R,L]
RewriteRule ^/merged/pool/MARILLAT/(.*)$ http://www.deb-multimedia.org/pool/$1 [R,L]
RewriteRule ^/merged/dists/(.*)/main/(installer-.*)/(.*)$ /devuan/dists/$1/main/$2/$3 [L]
RewriteRule ^/merged/dists/ascii-security/(.*)$ http://amprolla.devuan.org/merged/dists/ascii-security/$1 [R,L]
RewriteRule ^/merged/dists/jessie-security/(.*)$ http://amprolla.devuan.org/merged/dists/jessie-security/$1 [R,L]