Remove HtmlPrettifyMiddleware (used in development mode)

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.

swh/web/settings/development.py

@@ -10,9 +10,6 @@ Django development settings for swh-web.
 from django.core.cache import cache
 
 from .common import *  # noqa
-from .common import MIDDLEWARE
-
-MIDDLEWARE += ["swh.web.utils.middlewares.HtmlPrettifyMiddleware"]
 
 AUTH_PASSWORD_VALIDATORS = []  # disable any pwd validation mechanism
 

swh/web/utils/__init__.py

@@ -413,6 +413,11 @@ def prettify_html(html: str) -> str:
     """
     Prettify an HTML document.
 
+    Since it adds whitespace (in the form of newlines), this method changes
+    the meaning of the HTML document and should not be used for reformatting
+    purpose. The goal is to help visually understanding the structure of the
+    document.
+
     Args:
         html: Input HTML document
 

swh/web/utils/middlewares.py

@@ -6,32 +6,9 @@
 
 from htmlmin import minify
 
-from swh.web.utils import prettify_html
 from swh.web.utils.exc import handle_view_exception, sentry_capture_exception
 
 
-class HtmlPrettifyMiddleware(object):
-    """
-    Django middleware for prettifying generated HTML in
-    development mode.
-    """
-
-    def __init__(self, get_response):
-        self.get_response = get_response
-
-    def __call__(self, request):
-        response = self.get_response(request)
-        if "text/html" in response.get("Content-Type", ""):
-            if hasattr(response, "content"):
-                content = response.content
-                response.content = prettify_html(content)
-            elif hasattr(response, "streaming_content"):
-                content = b"".join(response.streaming_content)
-                response.streaming_content = prettify_html(content)
-
-        return response
-
-
 class HtmlMinifyMiddleware(object):
     """
     Django middleware for minifying generated HTML in