Refresh Witnesses page design

Small update to the witnesses page to add more information:

Added ability to highlight a specific witness on the page by using the query string highlight. If the requested witness is in the Top100, it will scroll down and highlight the witness:

If the requested witness is low ranking, it will scroll down to the input box and pre-populate with the witness username:

Demo site: https://wallet.hivean.com/~witnesses?highlight=quochuy

src/app/components/elements/Icon.jsx

@@ -57,6 +57,7 @@ const icons_map = {};
 for (const i of icons) icons_map[i] = require(`assets/icons/${i}.svg`);
 
 const rem_sizes = {
+    '0.7x': '0.7',
     '1x': '1.12',
     '1_5x': '1.5',
     '2x': '2',
@@ -69,7 +70,16 @@ const rem_sizes = {
 export default class Icon extends React.Component {
     static propTypes = {
         name: PropTypes.string.isRequired,
-        size: PropTypes.oneOf(['1x', '1_5x', '2x', '3x', '4x', '5x', '10x']),
+        size: PropTypes.oneOf([
+            '0.7x',
+            '1x',
+            '1_5x',
+            '2x',
+            '3x',
+            '4x',
+            '5x',
+            '10x',
+        ]),
         inverse: PropTypes.bool,
         className: PropTypes.string,
     };