docs: mark action as deprecated

There are other maintained versions of this action out there. Use those instead
articulate · Sep 23, 2024 · 6ce8c7b · 6ce8c7b
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 # markdownlint action
 
+> [!CAUTION]
+> This action is deprecated. Use [DavidAnson/markdownlint-cli2-action](https://github.com/DavidAnson/markdownlint-cli2-action)
+> or [super-linter](https://github.com/super-linter/super-linter) instead.
+
 This action lints your Markdown files with [markdownlint-cli](https://github.com/igorshubovych/markdownlint-cli).
 
 ## Usage