feature #13746 Adding details about Encore dev-server and https (weaverryan)

This PR was squashed before being merged into the 5.0 branch.

Discussion
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Adding details about Encore dev-server and https

Hi!

See: https://github.com/symfony/cli/issues/93

Just some missing docs on use the `dev-server` with the Symfony binary.

Commits
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828eb9b Adding details about Encore dev-server and https

Author: weaverryan

frontend/encore/dev-server.rst

@@ -17,6 +17,24 @@ Twig shortcuts (or are :ref:`processing your assets through entrypoints.json <lo
 in some other way), you're done: the paths in your templates will automatically point
 to the dev server.
 
+Enabling HTTPS using the Symfony Web Server
+-------------------------------------------
+
+If you're using the :doc:`Symfony web server </setup/symfony_server>` locally with HTTPS,
+you'll need to also tell the dev-server to use HTTPS. To do this, you can reuse the Symfony web
+server SSL certificate:
+
+.. code-block:: terminal
+
+    # Unix-based systems
+    $ yarn dev-server --https --pfx=$HOME/.symfony/certs/default.p12
+
+    # Windows
+    $ encore dev-server --https --pfx=%UserProfile%\.symfony\certs\default.p12
+
+dev-server Options
+------------------
+
 The ``dev-server`` command supports all the options defined by `webpack-dev-server`_.
 You can set these options via command line options: