Add search engine selector to search bar UI

Introduced a search engine selector dropdown in the search bar, allowing users to choose between Google, Bing, and DuckDuckGo. Updated the search logic to use the selected engine and added corresponding SVG icons. Adjusted CSS and HTML structure to accommodate the new selector.

assets/images/icons/Bing.svg

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="Layer_1" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xodm="http://www.corel.com/coreldraw/odm/2003" viewBox="0 0 396 537">
+  <!-- Generator: Adobe Illustrator 29.6.1, SVG Export Plug-In . SVG Version: 2.1.1 Build 9)  -->
+  <defs>
+    <style>
+      .st0 {
+        fill: url(#linear-gradient);
+        fill-rule: evenodd;
+      }
+    </style>
+    <linearGradient id="linear-gradient" x1="33174.52" y1="-10318.51" x2="32748.82" y2="-30894.15" gradientTransform="translate(-738.46 -250.12) scale(.03 -.03)" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#26b8f4"/>
+      <stop offset="1" stop-color="#1b48ef"/>
+    </linearGradient>
+  </defs>
+  <g id="Camada_x5F_1">
+    <polygon class="st0" points="18.24 7.68 121.67 44.11 122.02 406.95 266.22 322.9 195.86 289.99 150.71 177.85 379.62 258.02 379.43 375.52 121.65 524 18.58 466.65 18.24 7.68"/>
+  </g>
+</svg>

assets/images/icons/duckduckgo.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 122.88 122.88"><defs><style>.a{fill:#d53;}.b{fill:#fff;}.c{fill:#ddd;}.d{fill:#fc0;}.e{fill:#6b5;}.f{fill:#4a4;}.g{fill:#148;}</style></defs><title>duckduckgo</title><path class="a" d="M122.88,61.44a61.44,61.44,0,1,0-61.44,61.44,61.44,61.44,0,0,0,61.44-61.44Z"/><path class="b" d="M114.37,61.44a52.92,52.92,0,1,0-15.5,37.43,52.76,52.76,0,0,0,15.5-37.43Zm-13.12-39.8A56.29,56.29,0,1,1,61.44,5.15a56.12,56.12,0,0,1,39.81,16.49Z"/><path class="c" d="M43.24,30.15C26.17,34.13,32.43,58,32.43,58l10.81,52.9,4,1.71-4-82.49Zm-4-10.24H34.7L41,22.19s-6.26,0-6.26,4C48.36,25.6,54.61,29,54.61,29l-15.36-9.1Zm0,0Z"/><path class="b" d="M75.66,115.48S62,93.87,62,79.64c0-26.73,17.63-4,17.63-25S62,28.44,62,28.44c-8.53-10.8-25-8.53-25-8.53l4,2.28s-4,1.13-5.12,2.27,10.81-1.7,15.93,2.85C30.72,29,34.13,46.08,34.13,46.08l11.95,68.27,29.58,1.13Zm0,0Z"/><path class="d" d="M75.66,60.87l21.62-5.69C116.62,58,80.78,68.84,78.51,68.27c-17.07-2.85-12,11.37,8.53,6.82s5.12,11.38-13.65,5.12c-26.74-7.39-12.52-20.48,2.27-19.34Z"/><path class="e" d="M70,105.81l1.14-1.7c12.52,4.55,13.09,6.25,12.52-5.12s0-11.38-13.09-1.71c0-2.84-7.39-1.71-8.53,0-11.95-5.12-13.09-6.83-12.52,1.14,1.14,16.5.57,13.65,11.95,8l8.53-.57Zm0,0Z"/><path class="f" d="M60.87,99.56v6.82c.57,1.14,9.67,1.14,9.67-1.14s-4.55,1.71-7.39.57S62,98.42,62,98.42l-1.14,1.14Zm0,0Z"/><path class="g" d="M48.36,43.24c-2.85-3.42-10.24-.57-8.54,4,.57-2.28,4.55-5.69,8.54-4Zm18.2,0c.57-3.42,6.26-4,8-.57a8,8,0,0,0-8,.57Zm-18.77,9.1a1.14,1.14,0,1,1,0,.57v-.57Zm-4.55,2.27a4,4,0,1,0,0-.57v.57Zm29.58-4a1.14,1.14,0,1,1,0,.57v-.57ZM69.4,52.91a3.42,3.42,0,1,0,0-.57v.57Zm0,0Z"/></svg>

assets/images/icons/google.svg

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