Display d3js chord dependency diagram of gn2 dependenices...* wqflask/wqflask/markdown_routes.py: Add new bs4 import.
(references): Filter out javascript from the guix-generated d3js html
file and pass it to the jinja template.
* wqflask/wqflask/static/new/css/markdown.css: New styles for the
graph content.
* wqflask/wqflask/templates/environment.html: New graph content.
Fetch file from systempath when loading "/environments" route...* wqflask/wqflask/markdown_routes.py:
(render_markdown): Extend function to check whether "file_name" is to
be fetched remotely or locally in syspath.
(environments): Extend route to fetch from syspath if dependency file
exists there; otherwise fetch remotely from Github as a fallback.
