chore(docs): reorganize setup guides

docs/setup/unsigned/windows.md

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+# Setup Sprout for Windows without Secure Boot
+
+## Prerequisites
+
+- Secure Boot is disabled or configured to allow Sprout
+- UEFI Windows installation
+
+## Step 1: Base Installation
+
+First, mount the EFI System Partition on your Windows installation:
+
+In an administrator command prompt, run:
+
+```batch
+> mountvol X: /s
+```
+
+This will mount the EFI System Partition to the drive letter `X:`.
+
+Please note that Windows Explorer will not let you see the drive letter `X:` where the ESP is mounted.
+You will need to use the command prompt or PowerShell to access the ESP.
+Standard editors can, however, be used to edit files on the ESP.
+
+Download the latest sprout.efi release from the [GitHub releases page](https://github.com/edera-dev/sprout/releases).
+For x86_64 systems, download the `sprout-x86_64.efi` file, and for ARM systems, download the `sprout-aarch64.efi` file.
+Copy the downloaded `sprout.efi` file to `X:\EFI\BOOT\sprout.efi` on your EFI System Partition.
+
+## Step 3: Configure Sprout
+
+Write the following file to `X:\sprout.toml`:
+
+```toml
+# sprout configuration: version 1
+version = 1
+
+# global options.
+[options]
+# enable autoconfiguration to detect Windows.
+autoconfigure = true
+```
+
+## Step 4: Configure EFI Firmware to boot Sprout
+
+It is not trivial to add an EFI boot entry inside Windows.
+However, most firmware lets you load arbitrary EFI files from the firmware settings.
+
+You can boot `\EFI\BOOT\sprout.efi` from firmware to boot Sprout.