Big refactor, many minor fixes (#441)

* Big refactor, many minor fixes

* Link fixes, icon edits

* Index and ToC fixes

* update icons in theme lib and add to device guides index

* WIP - refactor Initial setup, LAN, FF, others

* First draft ready, many fixes and edits

* Ooops - minor edits and changes on initial setup

* Add change password guide (try 2).

* Remove change password menu item from guides

* Fix display bug, think different

---------

Co-authored-by: Lucy Cifferello <12953208+elvece@users.noreply.github.com>
Co-authored-by: gStart9 <george@start9labs.com>

site/source/user-manual/customize.rst

@@ -1,24 +0,0 @@
-.. _customize:
-
-=========
-Customize
-=========
-
-.. contents::
-  :depth: 2 
-  :local:
-
-Custom Browser Tab Title
-------------------------
-
-#. Go to *System > Browser Tab Title*.
-
-    .. figure:: /_static/images/config/basic-config1.png
-      :width: 60%
-      :alt: Preferences
-
-#. Enter the desired name and click ``Save``
-
-    .. figure:: /_static/images/config/basic-config2.png
-      :width: 60%
-      :alt: Custom browser tab