[tox] Update doc testenv to account for documentation restructuring * Build doc from `doc` directory. * Use `sphinx-build` directly instead of `make` as this now works and allows to build within .tox temporary environment (instead of doc/_build), preferable for a "test" action. Related to #5447161.

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Add some entities

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As manager, you can access to entity creation forms by using the `site management`_ page.

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.. _`site management`: ../manage

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As regular user, the index page or the action box may propose some links to create entities according to the context.

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