Document extra installation step for M1 Mac (#2535)

* Document extra installation step for M1 Mac * Correct the M1 Mac vips explanation
emotion-js · Nov 1, 2021 · 01e4e0f · 01e4e0f
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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 ## Installation
 
+- (If using an M1 Mac) Install `vips` via Homebrew: `brew install vips`.
+  - This step can be removed from this document if we upgrade to the latest
+    version of Gatsby, which is compatible with sharp 0.28.0+ which does include
+    binaries for M1 Macs.
 - Run `yarn` in the repository's root directory to install everything you need for development.
 - Run `yarn build` in the root directory to build the modules.