Use extlinks extension

Provides an easy way to link to Github issues, Forum topics, Qubes website
and Wikipedia articles.

developer/debugging/automated-tests.rst

@@ -7,7 +7,7 @@ Unit and Integration Tests
 --------------------------
 
 
-Starting with Qubes R3 we use `python unittest <https://docs.python.org/3/library/unittest.html>`__ to perform automatic tests of Qubes OS. Despite the name, we use it for both `unit tests <https://en.wikipedia.org/wiki/Unit_tests>`__ and `integration tests <https://en.wikipedia.org/wiki/Integration_tests>`__. The main purpose is, of course, to deliver much more stable releases.
+Starting with Qubes R3 we use `python unittest <https://docs.python.org/3/library/unittest.html>`__ to perform automatic tests of Qubes OS. Despite the name, we use it for both :wikipedia:`unit tests <Unit_tests>` and :wikipedia:`integration tests <Integration_tests>`. The main purpose is, of course, to deliver much more stable releases.
 
 The integration tests must be run in dom0, but some unit tests can run inside a VM as well.
 

developer/debugging/mount-lvm-image.rst

@@ -55,4 +55,4 @@ References
 ----------
 
 
-Please consult this issue’s `comment <https://github.com/QubesOS/qubes-issues/issues/4687#issuecomment-451626625>`__.
+Please consult this issue’s :issue:`comment <4687#issuecomment-451626625>`.

developer/debugging/test-bench.rst

@@ -17,7 +17,7 @@ Install ISO
 ^^^^^^^^^^^
 
 
-First, do a clean install from the ``.iso`` :doc:`you built </developer/building/qubes-iso-building>` or grabbed elsewhere (for example `here <https://forum.qubes-os.org/t/qubesos-4-1-alpha-signed-weekly-builds/3601>`__).
+First, do a clean install from the ``.iso`` :doc:`you built </developer/building/qubes-iso-building>` or grabbed elsewhere (for example :topic:`here <qubesos-4-1-alpha-signed-weekly-builds/3601>`).
 
 Enabling Network Access in Dom0
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^