Rework documentation (#13709)

* Rework documentation

* Slightly adjust theme

* wip

* fixes

* Remove unneeded header

* Re-added Acknowledgement.md file

* Added Acknowledgement.md to mkdocs.yml

Co-authored-by: Neil Lathwood <gh+n@laf.io>

doc/Developing/os/Custom-Graphs.md

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-source: Developing/os/Custom-Graphs.md
-path: blob/master/doc/
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 First we define our graphs in `includes/definitions.inc.php` to share
 our work and contribute in the development of LibreNMS. :-) (or place
 in `config.php` if you don't plan to contribute)

doc/Developing/os/Health-Information.md

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-source: Developing/os/Health-Information.md
-path: blob/master/doc/
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 #### Sensors
 
 This document will guide you through adding health / sensor

doc/Developing/os/Initial-Detection.md

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-source: Developing/os/Initial-Detection.md
-path: blob/master/doc/
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 This document will provide the information you should need to add
 basic detection for a new OS.
 

doc/Developing/os/Mem-CPU-Information.md

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-source: Developing/os/Mem-CPU-Information.md
-path: blob/master/doc/
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 This document will guide you through adding detection for Memory /
 Processor for your new device.
 

doc/Developing/os/Settings.md

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-source: os/Settings.md
-path: blob/master/doc/
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 # Optional OS Settings
 
 This page documents settings that can be set in the os yaml files or

doc/Developing/os/Test-Units.md

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-source: Developing/os/Test-Units.md
-path: blob/master/doc/
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 # Tests
 
 Tests ensure LibreNMS works as expected, now and in the future.  New

doc/Developing/os/Wireless-Sensors.md

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-source: Developing/os/Wireless-Sensors.md
-path: blob/master/doc/
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 This document will guide you through adding wireless sensors for your
 new wireless device.