Instance description

This adds the instance description to the /collections/ page. I also
removed some code that optionally only shows the logged in users public
collections since this page is meant to only show public collections.
Users can view their collections in the /searches/ page.

Author: edsu

src/client/components/Collections/CollectionList.js

@@ -28,14 +28,7 @@ export default class CollectionList extends Component {
   }
 
   tick() {
-    const userId = this.props.forUserId
-    // If a userId is provided, show only searches for that user
-    if (userId) {
-      this.props.getPublicSearches(userId)
-    } else {
-      // Get searches for all users (TODO)
-      this.props.getPublicSearches()
-    }
+    this.props.getPublicSearches()
   }
 
   render() {    
@@ -44,7 +37,7 @@ export default class CollectionList extends Component {
         <Grid container spacing={3} className={style.Header}>
           <Grid item xs={9}>
             <Typography variant="body1">
-              MITH is using DocNow to collect tweets for humanities research.
+              { this.props.settings.instanceDescription }
             </Typography>
           </Grid>
           <Grid item xs={3}>