Redo: Add copy to clipboard for about brave page (fixes #5790)

Closes #6183

Redo PR #6107 (which was reverted with #6184)

- cherry-picked 942e95c
- Added brave.less for about:brave to fix regression on about pages

TODO: Pick up properties from history.less into brave.less

Auditors: @alexwykoff

Test Plan:
1. Visit about:about

js/about/brave.js

@@ -11,6 +11,7 @@ const aboutActions = require('./aboutActions')
 const ipc = window.chrome.ipcRenderer
 
 require('../../less/about/history.less')
+require('../../less/about/brave.less')
 require('../../node_modules/font-awesome/css/font-awesome.css')
 
 const tranformVersionInfoToString = (versionInformation) =>

less/about/brave.less

@@ -0,0 +1,16 @@
+@import "./common.less";
+
+.siteDetailsPage {
+  .siteDetailsPageContent {
+    .sectionTitle {
+      padding-left: 0;
+    }
+
+    .title {
+      width: 400px;
+      display: flex;
+      justify-content: space-between;
+      margin-left: @aboutPageSectionPadding;
+    }
+  }
+}

less/about/siteDetails.less

@@ -78,16 +78,10 @@ body {
     display: block;
     clear: both;
 
-    .title {
-      width: 400px;
-      display: flex;
-      justify-content: space-between;
-      margin-left: @aboutPageSectionPadding;
-    }
-
     .sectionTitle {
       font-size: 16px;
       margin-bottom: 12px;
+      padding-left: @aboutPageSectionPadding;
     }
   }
 }