[gnome-user-docs] gnome-help: Remove guide how to install Flash plugin

[Andre Klapper <aklapper src gnome org>]

commit a383f6c2c8ddfd3d972903dc625fa9b034a35740
Author: Andre Klapper <a9016009 gmx de>
Date:   Wed Sep 30 12:50:35 2020 +0200

    gnome-help: Remove guide how to install Flash plugin
    
    Mostly outdated, usually a security risk, and EOL in three months.
    
    Fixes #80

 gnome-help/C/net-browser.page       |   3 +-
 gnome-help/C/net-install-flash.page | 103 ------------------------------------
 gnome-help/Makefile.am              |   1 -
 3 files changed, 1 insertion(+), 106 deletions(-)
---
diff --git a/gnome-help/C/net-browser.page b/gnome-help/C/net-browser.page
index 23ef4ea1..fb4559e5 100644
--- a/gnome-help/C/net-browser.page
+++ b/gnome-help/C/net-browser.page
@@ -15,8 +15,7 @@
     <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
 
     <desc>
-      <link xref="net-default-browser">Change the default browser</link>,
-      <link xref="net-install-flash">install Flash</link>…
+      <link xref="net-default-browser">Change the default browser</link>
     </desc>
   </info>
 
diff --git a/gnome-help/Makefile.am b/gnome-help/Makefile.am
index 7e9d5c93..1239dec9 100644
--- a/gnome-help/Makefile.am
+++ b/gnome-help/Makefile.am
@@ -281,7 +281,6 @@ HELP_FILES = \
        net-firewall-ports.page \
        net-fixed-ip-address.page \
        net-general.page \
-       net-install-flash.page \
        net-macaddress.page \
        net-manual.page \
        net-mobile.page \