[chore] Readme, docker build

Dockerfile

@@ -1,4 +1,34 @@
-FROM nginx:alpine
+### BUILDER IMAGE ###
+FROM node:lts-alpine AS builder
 
-COPY public /usr/share/nginx/html/
+# Prepare the build directory, copy
+# relevant source + config files over.
+WORKDIR /build
+COPY app /build/app
+COPY config /build/config
+COPY public /build/public
+COPY \
+    .browserslistrc \
+    babel.config.js \
+    jsconfig.json \
+    package.json \
+    tsconfig.json \
+    yarn.lock \
+    /build/
+
+# Create a production build of the frontend.
+RUN yarn && yarn build:production
+
+### RUNTIME IMAGE ###
+FROM nginx:1.27.3-alpine AS runtime
+
+# Copy bigger nested stuff.
+COPY --from=builder /build/public/packs/js/flavours/glitch /usr/share/nginx/html/packs/js/flavours/glitch
+COPY --from=builder /build/public/packs/js/flavours/vanilla /usr/share/nginx/html/packs/js/flavours/vanilla
+
+# Copy remaining files.
+COPY --from=builder /build/public /usr/share/nginx/html/
+
+# Set up nginx.
 COPY nginx.conf /etc/nginx/nginx.conf
+EXPOSE 80