HtmlPrettifyMiddleware uses the `prettify()` method from BeautifulSoup.
Its documentation says:

> Since it adds whitespace (in the form of newlines), `prettify()` changes
> the meaning of an HTML document and should not be used to reformat one.
> The goal of `prettify()` is to help you visually understand the structure
> of the documents you work with.

Having HtmlPrettifyMiddleware enabled therefore leads to surprising
behavior, like extra spaces surrounding “something” when writing
`<code>something</code>` in a template.

Now that Django templates are prettified using `djlint`, this middleware
only has downsides. Let’s remove it entirely.