🔗 Fix all navigation links to use relative paths

Fixed absolute path links that were breaking navigation:
- Home page: /lesson1, /lesson2, /lesson3, /game → lesson1, lesson2, lesson3, game
- Lesson navigation: All inter-lesson links now use relative paths
- Game navigation: Back to lesson links fixed

This ensures proper navigation with the /OCR-CSharp-Tutorial/ base href.

Author: Alex J Lennon

src/web-tutorial/CSharpTutorial/Pages/Game.razor

@@ -247,7 +247,7 @@
     <div class="row mt-4">
         <div class="col-12">
             <div class="d-flex justify-content-between">
-                <a href="/lesson3" class="btn btn-outline-secondary">← Back to Lesson 3</a>
+                <a href="lesson3" class="btn btn-outline-secondary">← Back to Lesson 3</a>
                 <a href="/" class="btn btn-primary">Return to Home</a>
             </div>
         </div>

src/web-tutorial/CSharpTutorial/Pages/Home.razor

@@ -23,7 +23,7 @@
                         Start your programming journey with our interactive lessons. Each lesson builds on the previous one,
                         so you'll learn step by step without getting overwhelmed.
                     </p>
-                    <a href="/lesson1" class="btn btn-primary">Start with Lesson 1</a>
+                    <a href="lesson1" class="btn btn-primary">Start with Lesson 1</a>
                 </div>
             </div>
         </div>
@@ -36,7 +36,7 @@
                         All code examples run directly in your browser! No need to install anything - 
                         just click "Run Code" and see the results instantly.
                     </p>
-                    <a href="/game" class="btn btn-success">Try the Number Game</a>
+                    <a href="game" class="btn btn-success">Try the Number Game</a>
                 </div>
             </div>
         </div>
@@ -53,7 +53,7 @@
                         <p class="card-text small">Understand C# syntax, program flow, and I/O operations.</p>
                         <span class="badge bg-secondary mb-2">OCR: Programming Fundamentals</span>
                         <br>
-                        <a href="/lesson1" class="btn btn-outline-primary btn-sm">Start Lesson 1</a>
+                        <a href="lesson1" class="btn btn-outline-primary btn-sm">Start Lesson 1</a>
                     </div>
                 </div>
             </div>
@@ -64,7 +64,7 @@
                         <p class="card-text small">Master primitive data types, variables, and constants.</p>
                         <span class="badge bg-secondary mb-2">OCR: Data Representation</span>
                         <br>
-                        <a href="/lesson2" class="btn btn-outline-primary btn-sm">Start Lesson 2</a>
+                        <a href="lesson2" class="btn btn-outline-primary btn-sm">Start Lesson 2</a>
                     </div>
                 </div>
             </div>
@@ -75,7 +75,7 @@
                         <p class="card-text small">Implement selection and iteration programming constructs.</p>
                         <span class="badge bg-secondary mb-2">OCR: Programming Constructs</span>
                         <br>
-                        <a href="/lesson3" class="btn btn-outline-primary btn-sm">Start Lesson 3</a>
+                        <a href="lesson3" class="btn btn-outline-primary btn-sm">Start Lesson 3</a>
                     </div>
                 </div>
                 </div>

src/web-tutorial/CSharpTutorial/Pages/Lesson1.razor

@@ -156,7 +156,7 @@ class Program
         <div class="col-12">
             <div class="d-flex justify-content-between">
                 <a href="/" class="btn btn-outline-secondary">← Back to Home</a>
-                <a href="/lesson2" class="btn btn-primary">Next: Variables →</a>
+                <a href="lesson2" class="btn btn-primary">Next: Variables →</a>
             </div>
         </div>
     </div>

src/web-tutorial/CSharpTutorial/Pages/Lesson2.razor

@@ -193,8 +193,8 @@ Console.WriteLine($"Age: {age}");</code></pre>
     <div class="row mt-4">
         <div class="col-12">
             <div class="d-flex justify-content-between">
-                <a href="/lesson1" class="btn btn-outline-secondary">← Lesson 1: Hello World</a>
-                <a href="/lesson3" class="btn btn-primary">Next: Control Flow →</a>
+                <a href="lesson1" class="btn btn-outline-secondary">← Lesson 1: Hello World</a>
+                <a href="lesson3" class="btn btn-primary">Next: Control Flow →</a>
             </div>
         </div>
     </div>

src/web-tutorial/CSharpTutorial/Pages/Lesson3.razor

@@ -201,8 +201,8 @@ else
     <div class="row mt-4">
         <div class="col-12">
             <div class="d-flex justify-content-between">
-                <a href="/lesson2" class="btn btn-outline-secondary">← Lesson 2: Variables</a>
-                <a href="/game" class="btn btn-success">Try the Number Game! 🎮</a>
+                <a href="lesson2" class="btn btn-outline-secondary">← Lesson 2: Variables</a>
+                <a href="game" class="btn btn-success">Try the Number Game! 🎮</a>
             </div>
         </div>
     </div>