[docker] Tweak build instruction for the docs website
## Build
- docker build . -t gethue/website:latest -f tools/docker/website/Dockerfile
+ docker build . -t gethue/documentation:latest -f tools/docker/website/Dockerfile
## Push
- docker push gethue/website:latest
+ docker push gethue/documentation:latest
## Run
- docker run -it -p 80:80 gethue/website:latest
+ docker run -it -p 80:80 gethue/documentation:latest
