Remove dev-polygerrit.txt

This file only documents how to enable GWT/PG, and how to switch
between GWT/PG, and is no longer relevant after the removal of GWT.

Change-Id: I8a782c44bdd814a7062826232441f4bb3ae46c8c
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 589071a..d34e31e 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -5095,10 +5095,6 @@
 
 The format is one Base-64 encoded public key per line.
 
-== Configuring the Polygerrit UI
-
-Please see link:dev-polygerrit.html[UI] on configuring the Polygerrit UI.
-
 === Configurable Parameters
 
 site_path::
diff --git a/Documentation/dev-polygerrit.txt b/Documentation/dev-polygerrit.txt
deleted file mode 100644
index 5621d32..0000000
--- a/Documentation/dev-polygerrit.txt
+++ /dev/null
@@ -1,34 +0,0 @@
-= PolyGerrit - GUI
-
-== Configuring
-
-By default both GWT and PolyGerrit UI are available to users.
-
-To make PolyGerrit the default UI but keep GWT as a secondary UI:
-----
-[gerrit]
-        ui = POLYGERRIT
-----
-
-To disable GWT but not PolyGerrit:
-----
-[gerrit]
-        enableGwtUi = false
-        enablePolyGerrit = true
-----
-
-To enable GWT but not PolyGerrit:
-----
-[gerrit]
-        enableGwtUi = true
-        enablePolyGerrit = false
-----
-
-To switch to the PolyGerrit UI you have to add `?polygerrit=1` in the URL.
-
-for example https://gerrit.example.org/?polygerrit=1
-
-To disable PolyGerrit UI, change 1 to 0, which will take you back to GWT UI.
-
-
-More information can be found in the link:https://gerrit.googlesource.com/gerrit/+/master/polygerrit-ui/[README]