feat: Book image on home page now directs to book's Amazon page (#598)

## Description

The book image showing the Essential C# 12.0 cover is now clickable.
Clicking it opens Amazon's page for the book.

No open issue for this.

### Ensure that your pull request has followed all the steps below:
- [x] Code compilation
- [ ] Created tests which fail without the change (if possible) -
__N/A__
- [ ] All tests passing -
__EssentialCSharp.Web.Tests.FunctionalTests.WhenTheApplicationStarts_ItCanLoadLoadPages(relativeUrl:
"/guidelines") does not pass. I believe it's supposed to be pulling from
EssentialCSharp.Web/Guidelines/guidelines.json but that does not exist.
I'm not sure where it comes from, but I'm going to assume it's handled
elsewhere.__
- [ ] Extended the README / documentation, if necessary - __N/A__

---------

Co-authored-by: Benjamin Michaelis <[email protected]>

Author: Joshua-Lester3

EssentialCSharp.Web/Views/Home/About.cshtml

@@ -37,7 +37,9 @@
     <div class="row gx-5">
         <div class="col-12 col-md-6">
             <div class="d-flex align-items-center justify-content-center h-100">
-                <img src="/images/book.png" class="img-fluid" style="height: 450px" alt="Essential C Sharp Book">
+                <a href="https://a.co/d/95wxhTg" target="_blank">
+                    <img src="/images/book.png" class="img-fluid" style="height: 450px" alt="Essential C Sharp Book">
+                </a>
             </div>
         </div>
         <div class="col-12 col-md-6 mt-3">

EssentialCSharp.Web/Views/Home/Home.cshtml

@@ -28,7 +28,9 @@
     <div class="row gx-5">
         <div class="col-12 col-md-6">
             <div class="d-flex align-items-center justify-content-center h-100">
-                <img src="/images/book.png" class="img-fluid" style="height: 450px" alt="Essential C Sharp Book">
+                <a href="https://a.co/d/95wxhTg" target="_blank">
+                    <img src="/images/book.png" class="img-fluid" style="height: 450px" alt="Essential C Sharp Book">
+                </a>
             </div>
         </div>
         <div class="col-12 col-md-6 mt-3">