Update questions-and-answer-forums-with-askbot-on-ubuntu-16-04

docs/websites/forums/questions-and-answer-forums-with-askbot-on-ubuntu-16-04

@@ -181,6 +181,9 @@ Press **CTRL+O** to write then hit **ENTER** to save the file then **CTRL+X** to
 
 6.  Now Remove the default Nginx Server Blocks (Virtual Host) and default Nginix index file to add new `askbot` Nginx server blocks.
 
+{: .note}
+>After getting Letsencrypt SSL for your domain. This is necessary step to avoid nginx to show the default nginx web pages and this will also help to listen Gunicorn with nginx. Please delete the default nginx server blocks and default nginx index web page.
+
 	sudo rm -rf /etc/nginx/sites-available/default /etc/nginx/sites-enabled/default /var/www/html/index.nginx-debian.html
 
 7.  Add new `askbot` Nginx Server Blocks (Virtual Host) to run AskBot in Production Environment. In below, `example.com` is your domain name and `www.example.com` is your sub-domain name, `/home/example_user/askbot` is the working directory of AskBot, `unix:/home/example_user/askbot/askbot.sock` is the location of askbot sock file, `/home/example_user/askbot/askbot` is the location of askbot media files  (Images, Attachments, etc.) in **upfiles** directory and `/home/example_user/askbot` is the location of askbot static files (CSS, JS, etc.) in **static** directory.