build: remove needless packages from the production Docker image (#77)

docker/prod/app/Dockerfile

@@ -1,11 +1,9 @@
 FROM rust@sha256:a45bf1f5d9af0a23b26703b3500d70af1abff7f984a7abef5a104b42c02a292b AS builder
 
-RUN rustup target add wasm32-unknown-unknown \
- && cargo install dioxus-cli diesel_cli \
+RUN cargo install dioxus-cli diesel_cli \
  && apt-get update && apt-get install -y --no-install-recommends \
     nodejs=18.19.0+dfsg-6~deb12u2 \
     npm=9.2.0~ds1-1 \
-    supervisor=4.2.5-1 \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*