Make a full documentation site about the vaadin-maven-plugin

[khmarbaise]

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Describe your motivation

Actually the documentation pages do not contain all existing goals in the vaadin-maven-plugin. For example the clean-frontend is completely missing which is very helpful. Otherwise users will create a separate configuration with maven-clean-plugin.

Describe the solution you'd like

If you follow conventions the whole documentation site for the plugin can generated from the code which would contain all the goals which do exist. (Something like this: https://maven.apache.org/plugins/maven-compiler-plugin/plugin-info.html) As supplemental this would result in supporting the :help goal on command line...

Describe alternatives you've considered

It would be at least helpfull to have the full documentation in the manuals.