Update Dockerfile to no longer require python, make, etc.

Signed-off-by: Michael Irwin <mikesir87@gmail.com>

docs/tutorial/our-application/index.md

@@ -39,7 +39,7 @@ see a few flaws in the Dockerfile below. But, don't worry! We'll go over them.
     ```dockerfile
     FROM node:18-alpine
     # Adding build tools to make yarn install work on Apple silicon / arm64 machines
-    RUN apk add --no-cache python2 g++ make
+    RUN apk add --no-cache python3
     WORKDIR /app
     COPY . .
     RUN yarn install --production