Update Dockerfile, docker-compose, and package.json; add versioning script and styles for version display

Fix #21

public/css/style.css

@@ -16,7 +16,17 @@ h1 {
 
 #responseMessage {
     text-align: center;
-    color: green;}
+    color: green;
+}
+
+/* Add styles for the version number */
+#version {
+    color: #888; /* Subtle gray color */
+    font-size: 0.8em; /* Smaller font size */
+    text-align: right; /* Align text to the right */
+    margin: 0; /* Remove any default margin */
+    padding: 0; /* Remove any default padding */
+}
 
 .menu {
     position: relative;

public/index.html

@@ -61,6 +61,7 @@
             </div>
             <button class="btn waves-effect waves-light" type="submit">Spara uppgift</button>
             <p id="responseMessage"></p>
+            <p id="version"><!-- VERSION_PLACEHOLDER --></p>
         </form>
     </div>