added sleep logging workflow and overview page

src/baby_monitor/static/feedings.html

@@ -360,6 +360,7 @@
       <div class="menu-item" id="menuHome">🏠 Home</div>
       <div class="menu-item" id="menuAddChild">👶 Add Child</div>
       <div class="menu-item" id="menuDiapers">🧷 Diapers</div>
+      <div class="menu-item" id="menuSleep">😴 Sleep</div>
       <div class="menu-item logout" id="menuLogout">🚪 Logout</div>
     </div>
 
@@ -415,6 +416,10 @@
         window.location.href = "/diapers.html";
       });
 
+      document.getElementById("menuSleep").addEventListener("click", () => {
+        window.location.href = "/sleep.html";
+      });
+
       document.getElementById("menuLogout").addEventListener("click", () => {
         closeMenu();
         logout();