Attempt to use Rust to find link for latest build in simple http-based build repo

Objectives:

• find "latest" build package in http build repo

Assumptions:

• directory structure scheme is known and constant
• we know upfront which platform/package we want to find/download
• package naming scheme is known and constant

This is article(s) companion project, for details refer to:

• https://ihsahn.gitlab.io/2019-10-15-rust-na-prostym-przykladzie/
• https://ihsahn.gitlab.io/2020-04-11-rust-na-prostym-przykladzie-2/