Search within one manuscript

This feature uses a basic Django search.
The tutorial I used is on https://www.youtube.com/watch?v=eyAIAZr5Q3w, and the documentation is on https://docs.djangoproject.com/en/2.0/ref/contrib/postgres/search/
This feature is commented out in viewpage.html, line 148-154.
The issue with Search within the manuscript is described in Issues and Suggested to-do list The problem is how to incoperate JavaScript of the Modal so that the full page do not need reload again once search form is submitted.