remove unused ref directives

replace page refs with doc directives

docs/tutorial/database.rst

@@ -142,7 +142,7 @@ read from the file.
 
 :func:`click.command` defines a command line command called ``init-db``
 that calls the ``init_db`` function and shows a success message to the
-user. You can read :ref:`cli` to learn more about writing commands.
+user. You can read :doc:`/cli` to learn more about writing commands.
 
 
 Register with the Application
@@ -196,9 +196,9 @@ previous page.
     If you're still running the server from the previous page, you can
     either stop the server, or run this command in a new terminal. If
     you use a new terminal, remember to change to your project directory
-    and activate the env as described in :ref:`install-activate-env`.
-    You'll also need to set ``FLASK_APP`` and ``FLASK_ENV`` as shown on
-    the previous page.
+    and activate the env as described in :doc:`/installation`. You'll
+    also need to set ``FLASK_APP`` and ``FLASK_ENV`` as shown on the
+    previous page.
 
 Run the ``init-db`` command:
 

docs/tutorial/index.rst

@@ -1,5 +1,3 @@
-.. _tutorial:
-
 Tutorial
 ========
 
@@ -35,11 +33,11 @@ tutorial`_ in the Python docs is a great way to learn or review first.
 .. _official tutorial: https://docs.python.org/3/tutorial/
 
 While it's designed to give a good starting point, the tutorial doesn't
-cover all of Flask's features. Check out the :ref:`quickstart` for an
+cover all of Flask's features. Check out the :doc:`/quickstart` for an
 overview of what Flask can do, then dive into the docs to find out more.
 The tutorial only uses what's provided by Flask and Python. In another
-project, you might decide to use :ref:`extensions` or other libraries to
-make some tasks simpler.
+project, you might decide to use :doc:`/extensions` or other libraries
+to make some tasks simpler.
 
 .. image:: flaskr_login.png
     :align: center

docs/tutorial/next.rst

@@ -9,11 +9,11 @@ different due to the step-by-step nature of the tutorial.
 
 There's a lot more to Flask than what you've seen so far. Even so,
 you're now equipped to start developing your own web applications. Check
-out the :ref:`quickstart` for an overview of what Flask can do, then
+out the :doc:`/quickstart` for an overview of what Flask can do, then
 dive into the docs to keep learning. Flask uses `Jinja`_, `Click`_,
 `Werkzeug`_, and `ItsDangerous`_ behind the scenes, and they all have
 their own documentation too. You'll also be interested in
-:ref:`extensions` which make tasks like working with the database or
+:doc:`/extensions` which make tasks like working with the database or
 validating form data easier and more powerful.
 
 If you want to keep developing your Flaskr project, here are some ideas