Comprehensively update user manual and contributor guide, add Adam to core team

website/content/volunteer/guide/_unpublished/project-setup/knowing-your-tooling.md

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+title = "Knowing your tooling"
+
+[extra]
+order = 2 # Page number after chapter intro
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+
+## First time builds
+
+Slower.
+
+## Troubleshooting
+
+Delete the `target`, `pkg`, `node_modules`, and `dist` directories.
+
+## Slow builds
+
+If you're seeing the terminal spend several seconds installing wasm-opt every recompilation, reinstall the exact version of `wasm-bindgen-cli` that matches the `wasm-bindgen` dependency in [`Cargo.toml`](https://github.com/GraphiteEditor/Graphite/blob/master/Cargo.toml).
+
+## Rust Analyzer speed tips