misc: add djhtml files/notes (#69422)

.git-blame-ignore-revs

@@ -1,3 +1,5 @@
 5b9bc1ff57cfb47458d629c15bcae28ae0bc141b
 # apply isort and pyupgrade
 4729ef9a3bdf2f09541469802d0e7cc3b6a48405
+# misc: apply djhtml (#69422)
+d20066dc440cbffc765978f222bd97958753978e

.pre-commit-config.yaml

@@ -16,3 +16,8 @@ repos:
     hooks:
     - id: pyupgrade
       args: ['--keep-percent-format', '--py37-plus']
+- repo: https://github.com/rtts/djhtml
+  rev: 'v1.5.2'
+  hooks:
+    - id: djhtml
+      args: ['--tabwidth', '2']

README

@@ -343,9 +343,13 @@ pyupgrade is used to automatically upgrade syntax, using those parameters:
 
     pyupgrade --keep-percent-format --py37-plus
 
+djhtml is used to automatically indent html files, using those parameters:
+
+    django-upgrade --tabwidth 2
+
 There is .pre-commit-config.yaml to use pre-commit to automatically run black,
-isort and pyupgrade before commits. (execute `pre-commit install` to install
-the git hook.)
+isort, pyupgrade, and djhtml before commits. (execute `pre-commit install`
+to install the git hook.)
 
 Remarks
 =======