style: update index page

Author: yanglbme

index.html

@@ -44,7 +44,12 @@
         '/basic/.*/summary.md': '/basic/summary.md'
       },
       contributors: {
-        ignores: ['/README.md', '/README_EN.md', '/solution/README.md', '/solution/README_EN.md', '/summary.md']
+        repo: 'doocs/leetcode',
+        ignores: ['/README.md', '/README_EN.md', '/solution/README.md', '/solution/README_EN.md', '/summary.md'],
+        image: {
+          margin: '0.2em',
+          isRound: true
+        }
       },
       darklightTheme: {
         defaultTheme: 'light',