fix: include yarn in bootstrap (#5969)

wmak · web-flow · commit 9dca2444a1f8 · 2022-12-15T12:28:23.000-05:00
- Yarn wasn't included in the bootstrap, which meant the next step in
  the contributing docs of running `make` would fail
diff --git a/bin/bootstrap b/bin/bootstrap
@@ -12,7 +12,7 @@ if ! [ -x $(command -v homebrew) ]; then
 fi
 
 # Install system toolchain
-brew install volta pre-commit
+brew install volta pre-commit yarn
 
 # App dependencies
 make
