shift faq link to left hand bar (#648)

* shift faq to left hand bar

* Update _quarto.yml

Author: penelopeysm

_quarto.yml

@@ -134,6 +134,8 @@ website:
               - developers/inference/variational-inference/index.qmd
               - developers/inference/implementing-samplers/index.qmd
 
+        - faq/index.qmd
+
   back-to-top-navigation: true
   repo-url: https://github.com/TuringLang/docs
   repo-actions: [edit, issue]