Replace outdated screenshots and simplify documentation

Remove obsolete screenshots that no longer reflect the current UI and add a
single up-to-date overview image. Remove "marketing" stuff from README and About
page.

Author: jrauh01

README.md

@@ -10,7 +10,7 @@ The Icinga Cube is a tiny but useful [Icinga Web](https://github.com/Icinga/icin
 module. It currently shows host and service statistics (total count, health) grouped by
 various custom variables in multiple dimensions.
 
-![Cube - Overview](doc/img/cube_simple.png)
+![Cube - Overview](doc/img/cube_overview.png)
 
 It will be your new best friend in case you are running a large environment and
 want to get a quick answers to questions like:
@@ -31,31 +31,6 @@ want to get a quick answers to questions like:
   * Who is running the oldest ones? In production?
 * Which projects are still using physical servers in which environment?
 
-For Businessmen - Drill and Slice
----------------------------------
-
-Get answers to your questions. Quick and fully autonomous, using the cube
-requires no technical skills. Choose amongst all available dimensions and rotate
-the Cube to fit your needs.
-
-![Cube - Configure Dimensions](doc/img/cube_move-up.png)
-
-Want to drill down? Choose a slice and get your answers:
-
-![Cube - Configure Dimensions](doc/img/cube_slice.png)
-
-All facts configured for systems monitored by [Icinga](https://www.icinga.com/)
-can be used for your research.
-
-For Icinga Director users
--------------------------
-
-In case you are using the [Icinga Director](https://github.com/Icinga/icingaweb2-module-director),
-in addition to the multi-selection/edit feature the cube provides a nice way to
-modify multiple hosts at once.
-
-![Cube - Director multi-edit](doc/img/cube_director.png)
-
 Installation
 ------------
 

doc/01-About.md

@@ -4,7 +4,7 @@ The Icinga Cube is a tiny but useful [Icinga Web](https://github.com/Icinga/icin
 module. It currently shows host and service statistics (total count, health) grouped by
 various custom variables in multiple dimensions.
 
-![Cube - Overview](img/cube_simple.png)
+![Cube - Overview](img/cube_overview.png)
 
 It will be your new best friend in case you are running a large environment and
 want to get a quick answers to questions like:
@@ -25,31 +25,6 @@ want to get a quick answers to questions like:
   * Who is running the oldest ones? In production?
 * Which projects are still using physical servers in which environment?
 
-For Businessmen - Drill and Slice
----------------------------------
-
-Get answers to your questions. Quick and fully autonomous, using the cube
-requires no technical skills. Choose amongst all available dimensions and rotate
-the Cube to fit your needs.
-
-![Cube - Configure Dimensions](img/cube_move-up.png)
-
-Want to drill down? Choose a slice and get your answers:
-
-![Cube - Configure Dimensions](img/cube_slice.png)
-
-All facts configured for systems monitored by [Icinga](https://www.icinga.com/)
-can be used for your research.
-
-For Icinga Director users
--------------------------
-
-In case you are using the [Icinga Director](https://github.com/Icinga/icingaweb2-module-director),
-in addition to the multi-selection/edit feature the cube provides a nice way to
-modify multiple hosts at once.
-
-![Cube - Director multi-edit](img/cube_director.png)
-
 Installation
 ------------