Improve provider logos.

web/src/ProviderListPage.js

@@ -14,7 +14,7 @@
 
 import React from "react";
 import {Link} from "react-router-dom";
-import {Button, Popconfirm, Table} from 'antd';
+import {Button, Popconfirm, Table, Tooltip} from 'antd';
 import moment from "moment";
 import * as Setting from "./Setting";
 import * as ProviderBackend from "./backend/ProviderBackend";
@@ -142,7 +142,11 @@ class ProviderListPage extends React.Component {
             return text;
           } else {
             return (
+              <Tooltip title={record.type}>
+                <a target="_blank" rel="noreferrer" href={Provider.getAuthHomepage(record)}>
                   <img width={30} height={30} src={Provider.getAuthLogo(record)} alt={record.displayName} />
+                </a>
+              </Tooltip>
             )
           }
         }

web/src/auth/Provider.js

@@ -71,6 +71,20 @@ export function getAuthLogo(provider) {
   return `${StaticBaseUrl}/img/social_${provider.type.toLowerCase()}.png`;
 }
 
+export function getAuthHomepage(provider) {
+  const endpoint = authInfo[provider.type].endpoint;
+  const urlObj = new URL(endpoint);
+
+  let host = urlObj.host;
+  let tokens = host.split(".");
+  if (tokens.length > 2) {
+    tokens = tokens.slice(1);
+  }
+  host = tokens.join(".");
+
+  return `${urlObj.protocol}//${host}`;
+}
+
 export function getAuthUrl(application, provider, method) {
   if (application === null || provider === null) {
     return "";