HAProxy: Error Files - How to make them look professional?

[nasheayahu]

Netgate SG - 2100

Question, I would like to make my errorfile web pages look professional,

1. where do I store the icons, .jpg, etc.? or
2. is the only way to this is via Lua?
3. can you I use Lua to fetch content from my TrueNAS?, or
4. what is the best way?