How To : Nginx Wordpress Rewrite rules (With suPHP)

Im trying to take my website (A Wordpress site) from Apache to Nginx. When going to Nginx, we need to convert the htaccess rules to the Nginx config file... Can you please help me to conver this? Here is my Wordpress htaccess file : (Please note that i have Nginx with suPHP)

    RewriteEngine On
    RewriteCond %{HTTPS} on
    RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
    RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
    
    # REDIRECT to FEEDBURNER
    <IfModule mod_rewrite.c>
     RewriteCond %{REQUEST_URI} ^/feed/ [NC]
     RewriteCond %{HTTP_USER_AGENT} !(FeedBurner|FeedValidator) [NC]
     RewriteRule .* http://feeds.feedburner.com/techhamlet [L,R=302]
    
     RewriteCond %{REQUEST_URI} ^/comments/feed/ [NC]
     RewriteCond %{HTTP_USER_AGENT} !(FeedBurner|FeedValidator) [NC]
     RewriteRule .* http://feeds.feedburner.com/techhamlet/comments [L,R=302]
    </IfModule>
    
    <files wp-config.php>
    order allow,deny
    deny from all
    </files>
    
    # disable directory browsing
    Options All -Indexes
    
    RewriteEngine On
    RewriteBase /
    RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
    RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
    
    # BEGIN WordPress
    <IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteRule ^index\.php$ - [L]
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /index.php [L]
    </IfModule>
    # END WordPress

Code (markup):

 

I know this is off topic but why make a change like that?