In 2008 we announced the introduction of the phpBB wiki for development related documentation. In the past few years we also introduced several other locations which contain (development) documentation. Over time more and more documentation about Extensions and phpBB development moved over to these new locations.
Taking this and the fact that it's not feasible to maintain all of these locations into account, we have decided to merge the wiki into the other documentation locations.
All development related documentation can now be found in the development docs on area51: https://area51.phpbb.com/docs/dev/master/index.html
Extensions development documentation is part of the development documentation, and can be found at https://area51.phpbb.com/docs/dev/maste ... index.html
And as before, all user documentation can be found on https://www.phpbb.com/support/docs/, which includes the User Guide and the knowledge base.
We have added redirects to important pages from the wiki to the new locations for these articles.
If you want to contribute to the development documentation, or to the user guide, you can create a pull request on https://github.com/phpbb/documentation
If you have any questions or comments, we'll be happy to address them in the discussion topic.
The phpBB Team