website: fixes (#6454)

* add rtl support

* enable arabic language

* fix colors for navbar on RTL language and when scrolling to footer

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Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>

website/src/_data/languages.json

@@ -14,6 +14,7 @@
             "textColor": "white",
             "iconBg": "green",
             "enabled": true,
+            "home": true,
             "rtl": true
         },
         {