A number of hiccups / improvements for docs and deploy based on others experience

[hulto]

setup

• typo'd domain - can we make it easier to verify this step.
• unclear when certs are generating
• unclear what the oauth client secret is or that you need to specify one

Rust builds

• Fix build.rs to autobuild reflective loader for cross compile and native builds
• Add rust up and dependencies installs to docker containers