The website source code has been moved to iotdb repo from v0.10 on, named as module site.
However, normally guys who only care about the source code of IoTDB project may do not want to compile the website code (and the compiling is time consuming and memory consuming).
Now we can use `mvn package -pl '!site'` to disable the module.
However, I'd like to disable the module by default and if someone (e.g., the Jenkins server, the website developer) wants to run it, just run `mvn package -P site`.
Or, if we want to consider the module as a subproject in IDEAJ, just click the maven panel and click Profiles -> site.