RTL languages rendering fix

[emad-elsaid]

Writing in Right-to-left (RTL) languages needs special HTML rendering to make the text direction correct.

• Dir attribute needs to specify "ltr" (default) or "rtl" in case of right to left language.
• If the attribute is set to the HTML tag it sets the direction for the whole page.
• So having mixed content rtl + ltr needs dir="auto" which makes the element display correctly based on what language in it
• I made a transformer to add this attribute for couple node kinds for my project

Here is the fix in case anyone else encounter the issue and let me know If there is something better to do:

• https://github.com/emad-elsaid/xlog/blob/482043cf9caf508fcbdd2fd634084216735c1864/extensions/rtl/widgets.go
• an example of a page output https://www.emadelsaid.com/%D9%85%D8%B1%D8%A7%D8%AC%D8%B9%D8%A9%20%D8%B1%D9%88%D8%A7%D9%8A%D8%A9%20The%20Gods%20Themselves/

Also I have been working on this Xlog project for a while and mainly based on Goldmark https://xlog.emadelsaid.com/ it contains a small core and many extensions that's a mix of Goldmark parser and renderer extensions.