Add logos to homepage

homepage/home_img/github.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-github" viewBox="0 0 16 16">
+  <path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27s1.36.09 2 .27c1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.01 8.01 0 0 0 16 8c0-4.42-3.58-8-8-8"/>
+</svg>

homepage/home_static/style.css

@@ -61,13 +61,17 @@ a {
   max-width: 100%;
 }
 
-object {
+.card-body object {
   background-color: #f8f8f2;
   border-radius: 25% 25%;
   padding: 5px;
   box-shadow: 5px 5px #a09fa2;
 }
 
+.github-logo {
+  padding-right: 5px;
+}
+
 .card-set .card {
   border-radius: 0;
   border-bottom: 0;

homepage/index.html

@@ -49,19 +49,24 @@
             class="btn btn-lg btn-light"
             href="https://github.com/Wilfred/difftastic"
             role="button"
-            >GitHub</a
+            ><object
+              class="github-logo"
+              data="home_img/github.svg"
+              type="image/svg+xml"
+            ></object>
+            GitHub</a
           >
           <a
             class="btn btn-lg btn-light"
             href="https://difftastic.wilfred.me.uk/introduction.html"
             role="button"
-            >Manual</a
+            >📖 Manual</a
           >
           <a
             class="btn btn-lg btn-light"
             href="https://difftastic.wilfred.me.uk/installation.html"
             role="button"
-            >Install</a
+            >🚦 Install</a
           >
         </div>
       </div>