function to remove blog

src/freedombone-app-blog

 MY_BLOG_TITLE="My Blog"
 MY_BLOG_SUBTITLE="Another ${PROJECT_NAME} Blog"
 
+function remove_blog {
+	if ! grep -Fxq "install_blog" $COMPLETION_FILE; then
+		return
+	fi
+	if [ ! -d /var/www/$FULLBLOG_DOMAIN_NAME ]; then
+		rm -rf /var/www/$FULLBLOG_DOMAIN_NAME
+	fi
+	nginx_dissite $FULLBLOG_DOMAIN_NAME
+	if [ ! -f /etc/nginx/sites-available/$FULLBLOG_DOMAIN_NAME ]; then
+		rm -rf /etc/nginx/sites-available/$FULLBLOG_DOMAIN_NAME
+	fi
+	if [ $FULLBLOG_CODE ]; then
+		if [ -f /usr/bin/dynamicdns ]; then
+			sed -i "/$FULLBLOG_DOMAIN_NAME/d" /usr/bin/dynamicdns
+			sed -i "/$FULLBLOG_CODE/d" /usr/bin/dynamicdns
+		fi
+	fi
+	sed -i '/install_blog/d' $COMPLETION_FILE
+	sed -i '/Blog .*/d' $COMPLETION_FILE
+}
+
 function mark_blog_domain {
 	if [[ $SYSTEM_TYPE == "$VARIANT_CLOUD" || $SYSTEM_TYPE == "$VARIANT_MAILBOX" || $SYSTEM_TYPE == "$VARIANT_CHAT" || $SYSTEM_TYPE == "$VARIANT_SOCIAL" || $SYSTEM_TYPE == "$VARIANT_MEDIA" || $SYSTEM_TYPE == "$VARIANT_DEVELOPER" || $SYSTEM_TYPE == "$VARIANT_MESH" ]]; then
 		return
 	chown -R www-data:www-data /var/www/$FULLBLOG_DOMAIN_NAME/htdocs
 
 	if [[ $ONION_ONLY == "no" ]]; then
-	    function_check nginx_http_redirect
+		function_check nginx_http_redirect
 		nginx_http_redirect $FULLBLOG_DOMAIN_NAME
 		echo 'server {' >> /etc/nginx/sites-available/$FULLBLOG_DOMAIN_NAME
 		echo '    listen 443 ssl;' >> /etc/nginx/sites-available/$FULLBLOG_DOMAIN_NAME
 	echo '    }' >> /etc/nginx/sites-available/$FULLBLOG_DOMAIN_NAME
 	echo '}' >> /etc/nginx/sites-available/$FULLBLOG_DOMAIN_NAME
 
-    function_check create_site_certificate
+	function_check create_site_certificate
 	create_site_certificate $FULLBLOG_DOMAIN_NAME 'yes'
 
-    function_check configure_php
+	function_check configure_php
 	configure_php
 
 	# blog settings
 	echo ';Role' >> /var/www/$FULLBLOG_DOMAIN_NAME/htdocs/config/users/$MY_USERNAME.ini
 	echo 'role = admin' >> /var/www/$FULLBLOG_DOMAIN_NAME/htdocs/config/users/$MY_USERNAME.ini
 
-    function_check nginx_ensite
+	function_check nginx_ensite
 	nginx_ensite $FULLBLOG_DOMAIN_NAME
 
 	FULLBLOG_ONION_HOSTNAME=$(add_onion_service blog 80 ${FULLBLOG_ONION_PORT})
 	fi
 	echo "Blog onion domain:${FULLBLOG_ONION_HOSTNAME}" >> $COMPLETION_FILE
 
-    function_check add_ddns_domain
+	function_check add_ddns_domain
 	add_ddns_domain $FULLBLOG_DOMAIN_NAME
 
 	echo 'install_blog' >> $COMPLETION_FILE