Mirror documentation site excluding sibling directories

I can mirror certain directories from the Postgresql docs site with:

wget 
    --continue 
    --mirror 
    --convert-links 
    --adjust-extension 
    --page-requisites 
    --no-parent 
    --limit-rate=200k 
    https://www.postgresql.org/docs/18/
    https://www.postgresql.org/docs/17/
    https://www.postgresql.org/media/
    https://www.postgresql.org/dyncss/

But there is one file missing, the favicon.ico

That is because if I try to download it, it downloads the whole site which is huge. I tried it like this:

wget 
    --continue 
    --mirror 
    --convert-links 
    --adjust-extension 
    --page-requisites 
    --no-parent 
    --limit-rate=200k 
    --exclude-directories=/* 
    --include-directories=/media,/dyncss,/docs 
    https://www.postgresql.org/docs/18/
    https://www.postgresql.org/docs/17/
    https://www.postgresql.org/media/
    https://www.postgresql.org/dyncss/
    https://www.postgresql.org/favicon.ico

Is there a way to include the favicon.ico without downloading its siblings?