Add Flashing topic boxes and complete firmware flashing guide

site/source/user-manual/flashing/index.rst

@@ -6,10 +6,45 @@ Flashing
 
 Here you will find our flashing guides for ARM (Raspberry Pi) and x86 (most desktops, laptops, mini PCs, servers, etc) architectures. Librem Mini owners can use the firmware flashing guide to get embassyOS-specific firmware.
 
+.. raw:: html
+
+  <div class="topics-grid grid-container full">
+
+  <div class="grid-x grid-margin-x">
+
+.. topic-box::
+  :title: Flashing (ARM)
+  :link: flashing-arm
+  :icon: scylla-icon scylla-icon--apps
+  :class: large-4
+  :anchor: ARM Architecture
+
+  Flash embassyOS for use on a Raspberry Pi
+
+.. topic-box::
+  :title: Flashing (x86)
+  :link: flashing-x86
+  :icon: scylla-icon scylla-icon--overview
+  :class: large-4
+  :anchor: x86 Architecture
+
+  Flash embassyOS for use on an x86 machine
+
+.. topic-box::
+  :title: Flashing (Firmware)
+  :link: flashing-firmware
+  :icon: scylla-icon scylla-icon--integrations
+  :class: large-4
+  :anchor: Librem Mini Firmware
+
+  Flash custom eOS firmware on an existing Librem Mini
+
 .. toctree::
-  :includehidden:
+  :hidden:
   :maxdepth: 2
 
   flashing-arm
   flashing-x86
   flashing-firmware
+
+Appreciate what we're doing?  Please consider a `donation to Start9 <https://btcpay.start9.com/apps/2Et1JUmJnDwzKncfVBXvspeXiFsa/crowdfund>`_.