android: added droidcam and changed webcam

the droidcam entry was created and linked to various entries.
the webcams was moved out of linux due to its general character.
the links to the webcams entry were updated and more were added where useful.

wiki/linux/v4l2.md

@@ -2,7 +2,8 @@
 
 V4L2 is the second version of
 [Video4Linux](https://www.linuxtv.org/wiki/index.php/Main_Page).
-It functions as a driver for webcams and tv tuner cards and other devices.
+It functions as a driver for [webcams](/wiki/webcams.md) and [tv tuner cards](/wiki/video.md) and
+other devices.
 
 ## v4l2loopback
 

wiki/linux/webcams.md

@@ -1,20 +0,0 @@
-# Webcams
-
-Webcams are video cameras which are designed to be used with a computer for
-streaming, video calls or similar usages.
-This section lists and explains software for the handling of webcams under a
-Linux operating system.
-
-## Editing Video Stream
-
-The editing of a video stream provided by a webcam can be achieved by using
-[OBS](/wiki/obs.md) together with the
-[OBS Virtual Camera plugin](/wiki/obs.md#virtual-camera).
-
-## Configure the Webcam
-
-A webcam can be configured with [guvcview](https://guvcview.sourceforge.net/).
-This program provides a simple interface for capturing and viewing video from a
-[v4l2](./v4l2.md) device and is thus dependent on v4l2.
-Additionally guvcview provides an interface to configure various webcam settins
-and enable a few effects on top of it.