Bumps [websocket-extensions](https://github.com/faye/websocket-extensions-node) from 0.1.3 to 0.1.4.
- [Release notes](https://github.com/faye/websocket-extensions-node/releases)
- [Changelog](https://github.com/faye/websocket-extensions-node/blob/master/CHANGELOG.md)
- [Commits](https://github.com/faye/websocket-extensions-node/compare/0.1.3...0.1.4)

Signed-off-by: dependabot[bot] <support@github.com>

Refactor/upgrade to django 2 LTS

+ Also fix the old middleware
+ Fix MIDDLEWARE name error

Signed-off-by: Lapo Luchini <lapo@lapo.it>

Signed-off-by: Lapo Luchini <lapo@lapo.it>

On many websites (just as in the page generated by our bookmarklet) images are put in CSS as background images; add support for those as well.

As using `*` currently selects 2.3.0 which requires `django >= 2.2`, which is not compatible with the rest of the Pipfile

`ERROR: ERROR: Could not find a version that matches django<1.12,>=1.11,>=1.11.0,>=2.2`

Fix  typo in js method

For Pillow: CVE-2020-5313, CVE-2019-19911
For Django: CVE-2020-7471, CVE-2019-19844

Create a 404 page

Feature: Add naive plugin support for pinry

Refine some parameter names and fix doc in comments.

Convert Dockerfile to Multi-Stage & Update .gitignore

Decrease Dockefile image from 1.46GB to 325MB. Speed up the build by leveraging Docker Multi-Stage technique and using python:3.7-slim-stretch as final image.

This change ignores the docker generated data.

Use jsDelivr for MDI for better global speed

This is extremely useful for mainland Chinese users.