Fix sed -i usage on macOS, accept 'Y'.

docs/static/setup.sh

@@ -90,7 +90,7 @@ fi
 echo ""
 read -p "Continue? [Yn]: " do_it
 
-if [ -n "$do_it" ] && [ "$do_it" != "y" ]; then
+if [ -n "$do_it" ] && [ "$do_it" != "y" ] && [ "$do_it" != "Y" ]; then
 	echo "Aborting..."
 	exit
 fi
@@ -108,7 +108,7 @@ fi
 
 popd
 
-sed -i \
+sed -i'.orig' \
 	-e "s/BOARD_NAME/$board/" \
 	-e "s/SHIELD_NAME/$shield/" \
 	-e "s/KEYBOARD_TITLE/$shield_title/" \
@@ -116,9 +116,11 @@ sed -i \
 
 if [ "$board" == "proton_c" ]; then
     # Proton-C board still fa
-    sed -i -e "s/uf2/hex/g" .github/workflows/build.yml
+    sed -i'.orig' -e "s/uf2/hex/g" .github/workflows/build.yml
 fi
 
+rm .github/workflows/*.yml.orig
+
 rm -rf .git
 git init .
 git add .