Fixed robots.txt and enabled more caching for docker

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

Dockerfile

@@ -11,7 +11,8 @@ COPY ./Cargo.toml ./Cargo.toml
 COPY ./input.css ./input.css
 COPY ./Dioxus.toml ./Dioxus.toml
 COPY ./tailwind.config.js ./tailwind.config.js
-RUN npx tailwindcss -i ./input.css -o ./assets/tailwind.css && dx build --platform fullstack --release
+RUN npx tailwindcss -i ./input.css -o ./assets/tailwind.css
+RUN dx build --platform fullstack --release
 
 FROM dioxus AS runner
 WORKDIR /app/