Add docs about packaging kernels (#1013)

Author: blink1073

docs/kernels.rst

@@ -184,3 +184,20 @@ To start the terminal console or the Qt console with a specific kernel::
 
 The notebook offers you the available kernels in a dropdown menu from the 'New'
 button.
+
+
+.. _packaging-kernels:
+
+Packaging
+=========
+
+To release your kernel as a Python package, we recommend following the pattern
+used in the :ref:`echo_kernel`, which uses the `hatch`_  build backend and
+a build file that creates the kernel directory with the ``kernel.json`` and
+kernel icons, which is included as ``shared-data``, ending up in the
+``share/jupyter/kernels/`` folder in the user's installed environment.
+See `pyproject.toml`_ and `hatch_build.py`_ for more details.
+
+.. _hatch: https://hatch.pypa.io/latest/
+.. _pyproject.toml: https://github.com/jupyter/echo_kernel/blob/main/pyproject.toml
+.. _hatch_build.py: https://github.com/jupyter/echo_kernel/blob/main/hatch_build.py

docs/wrapperkernels.rst

@@ -19,6 +19,7 @@ also has a ``ProcessKernel`` subclass that makes it easy to write kernels that
 use ``pexpect``.
 See `Octave Kernel <https://github.com/Calysto/octave_kernel>`_ as an example.
 
+If releasing a wrapper kernel as a Python package, see the steps in :ref:`packaging-kernels`.
 
 Required steps
 --------------
@@ -86,7 +87,7 @@ Example
 
 .. seealso::
 
-    `echo_kernel <https://github.com/jupyter/echo_kernel>`__
+    `echo_kernel <https://github.com/jupyter/echo_kernel>`_
       A packaged, installable version of the condensed example below.
 
 ``echokernel.py`` will simply echo any input it's given to stdout::