Add djhtml (https://github.com/rtts/djhtml), for auto-reformatting of the Django

templates via "djlint --profile django --reformat".

It still has some bugs and issues, esp. on complex templates and with regards to
whitespace after links, but those are manageable, and the benefits of having
consistently-formatted templates IMO outweigh them.

Commit ready for merge.
 - Legacy-Id: 19834

Author: larseggert

requirements.txt

@@ -72,4 +72,5 @@ Unidecode>=0.4.18,<1.2.0
 #wsgiref>=0.1.2
 xml2rfc>=2.35.0
 xym>=0.4.4,!=0.4.7,<1.0
-#zxcvbn-python>=4.4.14		# Not needed until we do back-end password entropy validation
+#zxcvbn-python>=4.4.14		# Not needed until we do back-end password entropy validation
+djhtml>=1.4.11  # To auto-indent templates via "djlint --profile django --reformat"