fix(docs): Use Kramdown processor (#6677)

* Update _config.yml

* add markdown=1

* add markdown="1"

* add markdown="1"

* remove extra space?

* update url

* try

* undo, wrong branch

* complete removing spaces?

Initial addressed at commit 83b7ee4112

* explicitly use kramdown

* try undo url change

* redoing url change

specifying `markdown: kramdown` explicitly did not change url parsing behavior

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

docs/CONTRIBUTING-fa_IR.md

@@ -1,6 +1,6 @@
 *[این متن را در زبان‌های دیگر بخوانید](../README.md#translations)*
 
-<div dir="rtl">
+<div dir="rtl" markdown="1">
 
 ## توافقنامه‌ی مجوز همکاری