docs: add dashmate import details (dashpay#353)

* docs: dashmate masternode import wip

* docs: update dashmate screenshots and import section

* docs: update dashmate download version

* docs: minor edits

* docs: make dropdown for node install option

Author: thephez

docs/user/network/dashmate/img/4a-import-existing-data.png

@@ -22,6 +22,9 @@ and easily set up and run a development network on your local system.
 Installation
 ============
 
+This guide describes how to download, install and use dashmate on for Linux. The guide is written
+for Ubuntu 22.04 x64 LTS, but the steps should be similar for other Linux distributions.
+
 .. _dashmate-dep-install:
 
 Install dependencies
@@ -38,45 +41,53 @@ Install and configure Docker::
 Install dashmate
 ----------------
 
-There are several methods available for installing dashmate.
+There are several methods available for installing dashmate. Installing the Linux, MacOS, or Windows
+packages from the `GitHub releases page <https://github.com/dashpay/platform/releases/latest>`__ is
+recommended for mainnet masternodes.
 
 .. _dashmate-install-deb:
 
 Debian package
 ^^^^^^^^^^^^^^
 
-Download the dashmate installation package::
+Download the dashmate installation package for your architecture from the `GitHub releases
+page <https://github.com/dashpay/platform/releases/latest>`__::
 
-   wget https://github.com/dashpay/platform/releases/download/v0.25.15/dashmate_0.25.15-1_arm64.deb
+   wget https://github.com/dashpay/platform/releases/download/v0.25.22/dashmate_0.25.22.b143aee50-1_amd64.deb
 
 Install dashmate using apt::
 
    sudo apt update
-   sudo apt install ./dashmate_0.25.15-1_arm64.deb
+   sudo apt install ./dashmate_0.25.22.b143aee50-1_amd64.deb
 
 Node package
 ^^^^^^^^^^^^
 
-To install the NodeJS package, it is necessary to install NodeJS first. We recommend
-installing it using `nvm <https://github.com/nvm-sh/nvm#readme>`__::
+.. warning:: This installation option is not recommended for mainnet masternodes. Please install
+            packages from the `GitHub releases page <https://github.com/dashpay/platform/releases/latest>`__.
+
+.. dropdown:: Node.js dashmate install
+
+   To install the NodeJS package, it is necessary to install NodeJS first. We recommend
+   installing it using `nvm <https://github.com/nvm-sh/nvm#readme>`__::
 
-  curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.5/install.sh | bash
-  source ~/.bashrc
-  nvm install 20
+     curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.5/install.sh | bash
+     source ~/.bashrc
+     nvm install 20
 
-Once NodeJS has been installed, use npm to install dashmate::
+   Once NodeJS has been installed, use npm to install dashmate::
 
-   npm install -g dashmate
+      npm install -g dashmate
 
 .. _dashmate-wizard-walkthrough:
 
 Masternode setup
 ================
 
-You can setup both regular masternodes and Evolution masternodes (evonodes)
-using dashmate. There are few minor extra steps for evonodes, but the process is
-largely identical for both masternode types. Complete the steps in the sections
-below to set up your node or follow along with this step-by-step tutorial.
+Dashmate is primarily recommended for setting up Evolution masternodes (evonodes). With the
+exception of a few minor extra steps for evonodes, the process is identical for evonodes and regular
+masternodes. Complete the steps in the sections below to set up your node or follow along with this
+step-by-step tutorial.
 
 .. raw:: html
 
@@ -112,6 +123,40 @@ about an existing masternode.
 
    Set up a new masternode
 
+If registering a new masternode, jump to the :ref:`defining keys and addresses
+<dashmate-define-keys-addresses>` section next.
+
+Import existing Core data
+-------------------------
+
+.. note:: The following step only applies when migrating an existing masternode into dashmate.
+
+If you chose to import an existing masternode in the previous step, you will be prompted for the
+location of your existing installation. 
+
+.. figure:: img/4a-import-existing-data.png
+   :align: center
+   :width: 90%
+
+   Import existing data
+
+.. figure:: img/4b-import-existing-data-path.png
+   :align: center
+   :width: 90%
+
+   Enter existing Core data directory
+
+.. figure:: img/4c-import-existing-data-complete.png
+   :align: center
+   :width: 90%
+
+   Core data import complete
+
+Once the Core data has been imported, jump to the :ref:`configure communication
+<dashmate-configure-communication>` section.
+
+.. _dashmate-define-keys-addresses:
+
 Define Keys and Addresses
 -------------------------
 
@@ -166,6 +211,8 @@ Optionally, use the one automatically generated by dashmate.
 
    Enter the Platform node key
 
+.. _dashmate-configure-communication:
+
 Configure communication
 -----------------------
 
@@ -197,6 +244,8 @@ details.
 
    Run the registration command
 
+.. _dashmate-enable-ssl:
+
 Enable SSL
 ----------