[Feature] Show progress during `find $DOMAIN` in `postwget`

[ilyaigpetrov]

find $DOMAIN -type f \( -name '*.htm*' -or -name '*.php*' \) -exec "$iterscript" "$DOMAIN" '{}' "$EXTERNALURLS" "$WGETREJECT" "$NOOVERREACH" -not -path "./$DOMAIN/wget-2-zim-overreach/*" \;:

https://github.com/ballerburg9005/wget-2-zim/blob/6f83e1125fe3cc09be4e2f1bc2c1fdc42959cc66/wget-2-zim.sh#L209

This line produces no debug output and takes about 3 hours to complete in my case. I suggest adding some hints for a user about progress of this task.