Add new chapter on Node commands

README.md

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+# book-cmds
+
+This project supports cmds.jamesrskemp.com, which is a collection of varous commands, for various programs.
+
+Git-specific commands are documented at [git.jamesrskemp.com](https://git.jamesrskemp.com).
+
+This site is possible thanks to [mdbook](https://github.com/rust-lang/mdBook) and [GitLab pages](https://about.gitlab.com/product/pages/).

src/SUMMARY.md

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 # Summary
 
+- [Node Commands](./node.md)
 - [Chapter 1](./chapter_1.md)

src/node.md

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+# Node
+
+Upgrade npm
+```
+npm install npm@latest -g
+```
+
+## Global Packages
+
+Find all globally installed packages
+```
+npm ls -g --depth 0
+```
+
+Install/update a package globally
+```
+npm install http-server -g
+```
+
+Find outdated global packages
+```
+npm outdated -g --depth=0
+```