Updated to use new theme for docs site (#9320)

* Updated to use new theme for docs site

* Updated theme location

* Removed librenms.css

* Updated index page + re-added librenms.css

* Use built in theme modification

* flexbox grid, dump bootstrap

* tidy up things

* Added path and updated deploy script + mkdocs config

* Removed db schmea changes

* Updated to install python/pip 3

* Removed pip3 install

* Pip3 install

* Updated deploy-docs

* Updated deploy-docs

doc/General/Acknowledgement.md

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 source: General/Acknowledgement.md
+path: blob/master/doc/
+path: blob/master/doc/
 
 LibreNMS wouldn't be what it is today without the use of some other amazing projects.
 We list below what we make use of including the license compliance. 

doc/General/CODE_OF_CONDUCT.md

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 source: General/CODE_OF_CONDUCT.md
+path: blob/master/doc/
 
 ## Our Pledge
 

doc/General/Callback-Stats-and-Privacy.md

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 source: General/Callback-Stats-and-Privacy.md
+path: blob/master/doc/
 ## Stats data and your privacy ##
 
 This document has been put together to explain what LibreNMS does when it calls back home to report some anonymous statistics.

doc/General/Contributing.md

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 <meta http-equiv="refresh" content="0; url=/Developing/" />

doc/General/Credits.md

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 <meta http-equiv="refresh" content="0; url=/General/Acknowledgement/" />

doc/General/Releases.md

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 source: General/Releases.md
+path: blob/master/doc/
 
 #### Introduction
 We try to ensure that breaking changes aren't introduced by utilising various automated 

doc/General/Security.md

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 source: General/Security.md
+path: blob/master/doc/
 
 ### General
 Like any good software we take security seriously. However, bugs do make it into the software 

doc/General/Updating.md

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 source: General/Updating.md
+path: blob/master/doc/
 
 By default, LibreNMS is set to automatically update. If you have disabled this feature then you can 
 perform a manual update.

doc/General/Welcome-to-Observium-users.md

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 source: General/Welcome-to-Observium-users.md
+path: blob/master/doc/
 
 LibreNMS is a fork of Observium.  The reason for the fork has nothing to do
 with Observium's [move to community vs. paid versions][1].  It is simply