Add replacement SVG icons

Author: Mars Lee

layouts/partials/scientific-domains.html

@@ -20,11 +20,11 @@
             <td class="bold-text">Cognitive Psychology </td>
         </tr>
         <tr>
-            <td><img class="cell-layout" src="images/content_images/sc_dom_img/quantum_computing.png"
+            <td><img class="cell-layout" src="images/content_images/sc_dom_img/quantum_computing.svg"
                     alt="A computer chip."></td>
             <td><img class="cell-layout" src="images/content_images/sc_dom_img/statistical_computing.svg"
                     alt="A line graph with the line moving up."></td>
-            <td><img class="cell-layout" src="images/content_images/sc_dom_img/signal_processing.png"
+            <td><img class="cell-layout" src="images/content_images/sc_dom_img/signal_processing.svg"
                     alt="A bar chart with positive and negative values."></td>
             <td><img class="cell-layout" src="images/content_images/sc_dom_img/image_processing.svg"
                     alt="An photograph of the mountains."></td>
@@ -85,12 +85,12 @@
                     alt="A strand of DNA."></td>
             <td><img class="cell-layout" src="images/content_images/sc_dom_img/bayesian_inference.svg"
                     alt="A graph with a bell-shaped curve."></td>
-            <td><img class="cell-layout" src="images/content_images/sc_dom_img/mathematical_analysis.png"
+            <td><img class="cell-layout" src="images/content_images/sc_dom_img/mathematical_analysis.svg"
                     alt="Four mathematical symbols."></td>
             <td><img class="cell-layout" src="images/content_images/sc_dom_img/chemistry.svg" alt="A test tube."></td>
             <td><img class="cell-layout" src="images/content_images/sc_dom_img/geoscience.svg" alt="The Earth."></td>
             <td><img class="cell-layout" src="images/content_images/sc_dom_img/GIS.svg" alt="A map."></td>
-            <td><img class="cell-layout" src="images/content_images/sc_dom_img/robotics.png"
+            <td><img class="cell-layout" src="images/content_images/sc_dom_img/robotics.svg"
                     alt="A microprocessor development board."></td>
         </tr>
         <tr>