added sighting list, and custom comment thread

src/pages/SightingList.js

@@ -1,13 +1,10 @@
 import React, { Component } from 'react';
 import ViewSightings from '../components/ViewSightings.js';
-import Typography from '@material-ui/core/Typography';
 
 class Sighting extends Component {
     render() {
         return (
-            <Typography variant='display1' align='center' gutterBottom>
-                <ViewSightings/>
-            </Typography>
+            <ViewSightings/>
         );
     }
 }