Improve redirects with map files

• https://cbonte.github.io/haproxy-dconv/1.7/configuration.html#7.1
• https://cbonte.github.io/haproxy-dconv/1.7/configuration.html#7.3.1-map
• https://stackoverflow.com/questions/23001799/how-do-i-used-the-map-feature-in-haproxy-to-build-massive-redirect-tables-1-5/25627447#25627447

http-request redirect location %[capture.req.uri,map(/etc/haproxy/redirect.map)] code 301 if { capture.req.uri,map(/etc/haproxy/redirect.map) -m found }

# Map File:
/some_old_page.html /some_new_page.html