restructure to account for new theme, add new build process, update readme

docs/source/user-manual/general/developer-options/alt-marketplace.rst

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+***********************
+Alternative Marketplace
+***********************
+
+EmbassyOS supports accessing alternative marketplaces by configuring a system file. Start9 is not responsible for issues encountered by downloading services from alternative marketplaces.
+
+After SSH-ing into the Embassy, run the following commands::
+
+    sudo systemctl stop agent
+    sudo sh -c "echo '<alternative_marketplace_url>' > /root/agent/alt_registry_url.txt"
+    sudo systemctl start agent
+
+The Embassy is now able to connect to the provided alternative registry.
+
+----
+
+To revert this change, simply delete the file::
+
+    sudo systemctl stop agent
+    sudo rm /root/agent/alt_registry_url.txt
+    sudo systemctl start agent

docs/source/user-manual/general/developer-options/index.rst

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+*****************
+Developer Options
+*****************
+
+.. toctree::
+  :maxdepth: 2
+
+  ssh-setup
+  alt-marketplace

docs/source/user-manual/general/developer-options/ssh-setup.rst

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+.. _ssh-setup:
+
+*********
+SSH Setup
+*********
+
+.. warning:: This is an advanced feature and should be used with caution. Start9 is not responsible for any damage you might cause through SSH access.
+
+Connecting via CLI
+==================
+
+#. Navigate to *Developer Options > SSH Keys*
+#. Click the ``+`` button in the lower right hand corner.
+#. Paste in your SSH key.
+#. You can now access your Embassy from the command line using::
+
+    ssh pi@<LAN URL>
+
+Connecting via SSH on Windows, using PuTTY
+==========================================
+
+One of our community members, @brewsbitcoin, has put together this guide for connecting via PuTTY on Windows: https://medium.com/@brewsbitcoin/ssh-to-start9-embassy-from-windows-4a4e17891b5a