[openstreetmap/openstreetmap-website] Add dir="auto" to Markdown content for bidi (PR #5840)

[Anton Khorev]

AntonKhorev left a comment (openstreetmap/openstreetmap-website#5840)

This is a version that modifies the document, consisting of replaced `document` method, assuming we don't need to add `dir` on inline elements:

```ruby
    def document
      return @document if @document

      @document = Kramdown::Document.new(self)

      add_dir = lambda do |element|
        target_types = %w[p header pre codeblock ul ol table dl math]
        element.attr["dir"] ||= "auto" if target_types.include?(element.type == :html_element ? element.value : element.type.to_s)
        element.children.each(&add_dir)
      end
      add_dir.call(@document.root)

      @document
    end
```

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