Add support for rtl and ltr shortcodes

[mohnoor94]

This is to support rtl and ltr short-codes.

Use Case:

You may need to insert some contents in a different direction compared to your main site direction so that these shortcodes will come in handy.

Important notes:

• These shortcodes will support nested shortcodes by default so that they won't markdownify your contents!
• If you want to markdownify (support md in) your contents, you can set the md parameter to true.

Examples:

{{< rtl >}}
{{< blockquote >}}

مرحبا بك

{{< /blockquote >}}
{{< /rtl >}}

This will result in a blockquote in rtl.

---

{{< rtl md=true >}}

> مرحبا بك

{{< /rtl >}}

This will result in rtl contents which rendered using md.

---

{{< rtl true >}}

> مرحبا بك

{{< /rtl }}

This will result in rtl contents which rendered using md (same example above, but with positional argument instead of a named argument in the content file).

---

The ltr shortcode could be used in the same way but in the context of an rtl website.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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[mohnoor94]

Replaced by #293