qt: created standalone article with configuration guide

wiki/communication.md

@@ -9,7 +9,7 @@ This article bundles all of them.
 This section lists some of the most common Voice over IP (VoIP) platforms.
 
 - [Matrix](/wiki/matrix.md) is a decentralized and open-source social platform.
-- [Discord](https://discord.com/) is a widely used, proprietary social platform.
+- [Discord](/wiki/discord.md) is a widely used, proprietary social platform.
 
 ### Soundboards
 

wiki/discord.md

@@ -0,0 +1,14 @@
+# Discord
+
+[Discord](https://discord.com/) is an social platform that combines voice and video conferences as
+well as instant messaging chats.
+
+## Usage
+
+This section addresses various features of Discord.
+
+### Disable Automatic Update Checks
+
+By default Discord performs an automatic check to see if it is up to date.
+On [Linux](/wiki/linux.md)-based systems it can be disabled by adding `"SKIP_HOST_UPDATE": true` to
+the `~/.config/discord/settings.json` file.

wiki/linux/pipewire.md

@@ -70,7 +70,49 @@ It needs to be set accordingly.
 pw-loopback -C <id>
 ```
 
-### Virtual devices
+### Virtual Devices
 
-A guide on how to create and configure virtual device permanently can be found on the
+The source for this section of the entry is derived by
 [Pipewire Gitlab site](https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/Virtual-Devices#behringer-umc404hd-speakersheadphones-virtual-sinks).
+
+#### Creating a Null Device
+
+A dummy device, or null sink, can be created permanently by creating a `.conf` file inside the
+`~/.config/pipewire/pipewire.conf.d` directory with the following lines.
+
+```txt
+context.objects = [
+    {   factory = adapter
+        args = {
+            factory.name     = support.null-audio-sink
+            node.name        = "null-sink-0"
+            node.description = "Null Sink 0"
+            media.class      = Audio/Sink
+            audio.position   = [ FL FR ]
+            monitor.channel-volumes = true
+            monitor.passthrough = true
+            adapter.auto-port-config = {
+                mode = dsp
+                monitor = true
+                position = preserve
+            }
+        }
+    }
+]
+```
+
+Multiple devices can be created by creating different files in the directory.
+
+If the null sink is only needed temporarily (until the next restart) the following line can be used
+to create it.
+Use different `sink_name`s to create multiple dummy devices.
+
+```sh
+pactl load-module module-null-sink media.class=Audio/Sink sink_name=null-sink-0 channel_map=stereo
+```
+
+This will return an id that can be used to remove the sink with the following command.
+
+```sh 
+pactl unload-module <id>
+```

wiki/linux/qt.md

@@ -0,0 +1,27 @@
+# Qt
+
+[Qt](https://www.qt.io/) is an application and widget toolkit.
+
+## Setup
+
+On most linux distributions different Qt versions are installed as a dependency of various programs
+that use graphical user interfaces.
+
+### Configuration
+
+The configuration can easily be achieved by using the programs
+[qt5ct](https://github.com/desktop-app/qt5ct) or [qt6ct](https://github.com/trialuser02/qt6ct)
+the latter working with the current version of Qt.
+qt5ct is officially archived and qt6ct is the recommended program to use and will mainly be
+discussed in this article.
+These programs can sometimes be found as [package](/wiki/linux/package_manager.md) of the same
+name.
+Afterwards `qt6ct` can be run to get a graphical user interface to set the theme and icons of Qt
+applications.
+This will create or edit a configuration file located at `~/.config/qt6ct/qt6ct.conf`.
+To make this config apply for all Qt applications the following line needs to be inserted into the
+`~/.profile` file.
+
+```sh
+export QT_QPA_PLATFORMTHEME="qt6ct"
+```