Due to performance reasons and weird css ordering in production mode, would be nice to set extractCSS setting for nuxt.js

ref: https://nuxtjs.org/api/configuration-build/#extractcss

WHAT

Make plot_duplicates output clearer.

WHY

The graph plotted by plot_duplicates output can be cluttered, especially when there are several duplicates found for an image. The titles of each image run into each other, which makes it hard to read the plot. Additionally, the titles can be hard to read, possibly due to a static dpi. An example can be seen below:

![imgdedup_plot_iss

Can you please add some performance numbers to the main project docs indicating inference latency running some common hardware options e.g. AWS p2, GCP gpu instance, CPU inference, Raspbery pi, etc.

Is your feature request related to a problem? Please describe.
Currently, if the developer wants to register a new admin account, it doesn't let it do that because sendgrid API keys are needed. Remove this dependency for local, and switch to using an identical emailService which uses Nodemailer (Gmail option preferred) since Nodemailer is free. Maybe feature flag this property

**Describe

Description

Great wagtail integration! Was trying to figure out on how to remove all items from the basket or a single product item. The current API allows subtracting the quantity of the product but not remove the product by itself.