Limit number of search results

The `GET` `/search` endpoint's limit parameter has been updated:

<table>
<tr>
<td>
Parameter
</td>
<td>Before</td>
<td>After</td>
</tr>
<tr><td>limit maximum</td>
<td>50</td>
<td>10</td>
</tr>
<tr>
<td>limit default</td>
<td>20</td>
<td>5</td>
<tr>
</table>
