fix: update hugo version

Dockerfile

 FROM alpine:latest as build
 
-ENV HUGO_VERSION 0.56.0
+ENV HUGO_VERSION 0.59.1
 ENV HUGO_BINARY hugo_${HUGO_VERSION}_Linux-64bit.tar.gz
 
 # Install Hugo

content/blog/2019/2019-11-24-build-go-plugins-using-docker.md

 RUN apk --no-cache add ca-certificates
 WORKDIR /myproject/
 # Copy the assets from the builder image
-COPY --from=builder /myproject-plugin/myproject/myproject /myproject-plugin/myproject-plugin/myproject/smtp.prov /myproject-plugin/myproject/bundled1.prov /myproject-plugin/myproject/bundled2.prov /myproject-plugin/myproject/myplugin.prov ./
+COPY --from=builder /myproject-plugin/myproject/myproject /myproject-plugin/myproject-plugin/myproject/bundled0.prov /myproject-plugin/myproject/bundled1.prov /myproject-plugin/myproject/bundled2.prov /myproject-plugin/myproject/myplugin.prov ./
 
-CMD ["./myproject", "--config", "/etc/myproject/config.toml", "--prov", "smtp.prov", "--prov", "bundled1.prov", "--prov", "bundled2.prov", "--prov", "myplugin.prov"]
+CMD ["./myproject", "--config", "/etc/myproject/config.toml", "--prov", "bundled0.prov", "--prov", "bundled1.prov", "--prov", "bundled2.prov", "--prov", "myplugin.prov"]
 ```
 
 This image can then be pushed and used where it needs to be deployed.