[docs] Remove BRIX from hardware recommendations; link from checklist

Part of freedomofpress#3826
Resolves freedomofpress#3197

docs/checklists/pre_install_hardware.rst

@@ -5,5 +5,8 @@ This is the *minimum* hardware that must be acquired to install SecureDrop:
 
 .. include:: ../includes/pre-install-hardware.txt
 
-.. note:: For additional details, please read the full document on
-       :ref:`Hardware Recommendations` for SecureDrop.
+.. important:: To avoid hardware compatibility issues, we strongly recommend
+  adhering to our
+  :ref:`specific hardware recommendations <Specific Hardware Recommendations>`.
+  Please review the :ref:`Hardware <hardware_guide>` section in full for further
+  details.

docs/hardware.rst

@@ -272,39 +272,13 @@ Specific Hardware Recommendations
 Application and Monitor Servers
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-We currently recommend the Gigabyte BRIX, Intel NUC, or Mac Mini for
-SecureDrop servers.
+We currently recommend the Intel NUC or Mac Mini for SecureDrop servers.
 
 .. note:: If using non-recommended hardware, ensure you remove as much
     extraneous hardware as physically possible from your servers. This
     could include: speakers, cameras, microphones, fingerprint readers,
     wireless, and Bluetooth cards.
 
-Gigabyte BRIX
-~~~~~~~~~~~~~
-
-The Gigabyte BRIX series is an inexpensive, quiet, low-power device that
-can be used for SecureDrop servers. There are a
-`variety of models <http://www.gigabyte.us/Mini-PcBarebone/BRIX>`__ to choose
-from; we recommend the GB-BXi5-5575. It has a mid-range CPU (the 5th
-generation Intel i5), a full-size HDMI port for a monitor, and four USB 2 ports.
-If you select a different model series (such as the GB-BSi5H) carefully
-verify that it uses the 5th generation Intel i5. Newer generation CPUs will
-**not** work with SecureDrop.
-
-The GB-BXi5-5575 supports wireless and Bluetooth through a removable card. This
-removable card is preferable, since you want neither WiFi nor Bluetooth. You
-can open the BRIX by removing the screws from the underside of the computer; the
-wireless card has one small screw you need to remove and two small connectors.
-
-The BRIXs come as kits, and some assembly is required. You will need to purchase
-the RAM and hard drive separately for each BRIX and insert both into the machine
-before it can be used. We recommend:
-
--  2x 240 GB SSDs (2.5")
--  1x memory kit of 2x4GB sticks (DIMM DDR3 1866MHz)
-   -  You can put one 4GB memory stick in each of the servers.
-
 Intel NUC
 ~~~~~~~~~