docs: improve USER-GUIDE.md formatting

Add consistent spacing between sections and subsections
to improve readability

USER-GUIDE.md

@@ -1,6 +1,7 @@
 # Stash User Guide
 
 ## Table of Contents
+
 1. [Introduction](#introduction)
 2. [Installation](#installation)
 3. [Basic Concepts](#basic-concepts)
@@ -25,30 +26,36 @@ Stash is a powerful symlink management utility that helps you organize your file
 ## Installation
 
 ### Prerequisites
+
 - Guile Scheme 3.0.9 or later
 - Unix-like environment (Linux/macOS)
 
 ### Step-by-Step Installation
 
 1. **Clone the Repository**:
+
    ```sh
    git clone https://codeberg.org/glenneth/stash.git
    cd stash
    ```
 
 2. **Set Up Guile Load Path**:
+
    ```sh
    mkdir -p ~/.guile.d/site/3.0
    ln -s $(pwd)/modules/stash ~/.guile.d/site/3.0/
    ```
 
 3. **Create Convenient Alias** (Optional):
+
    Add to your shell config (~/.bashrc or ~/.zshrc):
+
    ```sh
    alias stash="guile -L $(pwd) $(pwd)/stash.scm"
    ```
 
 4. **Verify Installation**:
+
    ```sh
    stash --help
    ```
@@ -70,6 +77,7 @@ Stash is a powerful symlink management utility that helps you organize your file
 ## Usage Patterns
 
 ### 1. Interactive Mode
+
 Best for beginners or when you want to choose the target location interactively.
 
 ```sh
@@ -77,6 +85,7 @@ stash --source ~/Pictures --interactive
 ```
 
 ### 2. Explicit Paths
+
 When you know exactly where you want to store files.
 
 ```sh
@@ -84,6 +93,7 @@ stash --source ~/Documents/notes --target ~/backup/notes
 ```
 
 ### 3. Dot Syntax
+
 Quick way to create symlinks for previously stashed files.
 
 ```sh
@@ -92,6 +102,7 @@ stash .    # Creates symlink in ~/.config/nvim
 ```
 
 ### 4. Recursive Mode
+
 For processing entire directory trees.
 
 ```sh
@@ -101,6 +112,7 @@ stash --source ~/.config --target ~/.dotfiles/config --recursive
 ## Common Use Cases
 
 ### 1. Managing Dotfiles
+
 Keep configuration files in a git repository:
 
 ```sh
@@ -113,6 +125,7 @@ stash .
 ```
 
 ### 2. Project Organization
+
 Archive old projects while keeping them accessible:
 
 ```sh
@@ -120,6 +133,7 @@ stash --source ~/projects/old-webapp --target ~/archive/projects/webapp
 ```
 
 ### 3. Cross-device File Management
+
 Store large files on external drives:
 
 ```sh
@@ -129,11 +143,13 @@ stash --source ~/Videos --target /media/external/videos --recursive
 ## Advanced Features
 
 ### 1. Path Handling
+
 - Supports home directory expansion (~)
 - Handles both absolute and relative paths
 - Maintains directory structure in target location
 
 ### 2. Symlink Management
+
 - Creates intermediate directories as needed
 - Handles existing symlinks gracefully
 - Preserves original file permissions
@@ -174,6 +190,7 @@ stash --source ~/Videos --target /media/external/videos --recursive
 ## Command Reference
 
 ### Basic Commands
+
 ```sh
 stash --help                 # Display help
 stash --version             # Show version
@@ -184,6 +201,7 @@ stash --interactive         # Interactive target selection
 ```
 
 ### Common Command Combinations
+
 ```sh
 # Interactive stashing
 stash -s ~/Documents -i