Update deployment instructions

deployment-instructions.md

@@ -140,6 +140,26 @@ REGISTRATION = False
 waitress-serve --port=5000 --call 'myriad:create_app'
 ```
 
+# 413: Request Entity Too Large (nginx)
+
+This will most likely occur if you have uploaded a lot of images to the site. You will need to edit your nginx config to allow you to upload large files. I would run these commands from outside of the tmux window, just so I can easily access my last used myriad server commands later. Otherwise, it doesn't matter where you do this. 
+
+```
+sudo nano /etc/nginx/nginx.conf
+```
+
+Within the http section, add
+
+```
+client_max_body_size 100M;
+```
+
+Save and exit, then reload nginx.
+
+```
+nginx -s reload
+```
+
 
 # Config