CDI documentation is updated

[Legioth]

https://vaadin.com/docs/latest/flow/integrations/cdi refers to "Java EE" in some places and prominently links to the Directory add-on that hasn't been updated since CDI was integrated into the core platform. This gives the impression that the support is outdated.

[caalador]

Would it be more preferable to link to the github project or mvnrepository?

[mcollovati]

mvnrepository is not an official maven repository. In case better linking Maven central

[caalador]

Well repository vs external.