feat: Replace the build_config() in the example code with config.toml

[jyc0011]

To solve #138, Refactoring the way Config structs are created. Modified Config to load and initialize directly from TOML configuration files.

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ jopemachine
❌ jyc0011
_{You have signed the CLA already but the status is still pending? Let us recheck it.}