Improve Pioneer links

Co-authored-by: ronso0 <ronso0@mixxx.org>

Author: daschuer

source/hardware/controllers/pioneer_ddj_400.rst

@@ -18,9 +18,9 @@ Pioneer DDJ-400
 The Pioneer DDJ-400 is a 2 deck USB controller with an integrated audio interface
 designed for rekordbox.
 
-- `Manufacturer's Product Page <https://www.pioneerdj.com/en/product/controller/ddj-400/black/overview/>`__
+- `Manufacturer's Product Page <https://www.pioneerdj.com/de/product/dj-controllers/ddj-400/>`__
 - `Manufacturer's User Manual <https://support.alphatheta.com/articles/4404919716761?product=4416577146009>`__
-- `Manufacturer's Firmware Update <https://support.alphatheta.com/products/4416577146009?section=25/>`__
+- `Manufacturer's Firmware Update <https://support.alphatheta.com/products/4416577146009?section=25>`__
 - `Mapping Forum Thread <https://mixxx.discourse.group/t/pioneer-ddj-400/17476>`__
 
 .. versionadded:: 2.3.0

source/hardware/controllers/pioneer_ddj_flx4.rst

@@ -19,7 +19,7 @@ Pioneer DDJ-FLX4
 The Pioneer DDJ-FLX4 is a 2 deck USB controller with an integrated audio interface
 designed for rekordbox and Serato.
 
-- `Manufacturer's Product Page <https://support.alphatheta.com/products/12077079532697>`__
+- `Manufacturer's Product Page <https://www.pioneerdj.com/product/dj-controllers/ddj-flx4/>`__
 - `Manufacturer's User Manual <https://support.alphatheta.com/articles/12267724407961>`__
 - `Hardware Diagram <https://downloads.support.alphatheta.com/software_info/dj-controllers/DDJ-REV1/DDJ-REV1_HardwareDiagram_SeratoDJLite_Pro_E1.pdf>`__
 - `Mapping Forum Thread <https://mixxx.discourse.group/t/pioneer-ddj-flx4/26553>`__

source/hardware/controllers/pioneer_ddj_sb3.rst

@@ -15,9 +15,9 @@ Pioneer DDJ-SB3
 
 The Pioneer DDJ-SB3 is a 4 deck USB DJ controller.
 
--  `Manufacturer's Product Page <https://www.pioneerdj.com/product/controller/ddj-sb3/black/overview/>`__
--  `Manufacturer's User Manual <https://support.alphatheta.com/articles/4404925658009?product=4416577034009/>`__
--  `Manufacturer's Firmware Update <https://support.alphatheta.com/products/4416577034009?section=25/>`__
+-  `Manufacturer's Product Page <https://www.pioneerdj.com/product/dj-controllers/ddj-sb3/>`__
+-  `Manufacturer's User Manual <https://support.alphatheta.com/articles/4404925658009?product=4416577034009>`__
+-  `Manufacturer's Firmware Update <https://support.alphatheta.com/products/4416577034009?section=25>`__
 -  `Mixxx User Forum <https://mixxx.discourse.group/t/pioneer-ddj-sb3-mapping-v1-0-now-available/22186>`__