The Rust Ecosystem Lecture (#92)

* add rustup, clippy, rustfmt to ecosystem lecture

* Add content for rand, time, and error handling

* rust toolchain section done

* finish toolchain section

* clean up criterion section

* add section headers

* progress on flamegraph

* finish criterion section

* finish flamegraph section

* progress on rand section

* finish rand section

* finish time section

* finish anyhow

* finish errors section

* remove rayon and serde into different file

* Fix typo

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Co-authored-by: fiona <[email protected]>
Co-authored-by: Terrance Yu-Hao Chen <[email protected]>

Author: 3 people