Fix section hierarchy in README.

The email section belongs under the multi-user section
and not under the reverse proxy section.

Author: Gittenburg

README.md

@@ -91,6 +91,9 @@ accidentally commit your certificates to `solid` while you're developing.
 
 If you would like to get rid of the browser warnings, import your fullchain.pem certificate into your 'Trusted Root Certificate' store.
 
+### Running Solid behind a reverse proxy (such as NGINX)
+See [Running Solid behind a reverse proxy](https://github.com/solid/node-solid-server/wiki/Running-Solid-behind-a-reverse-proxy).
+
 ### Run multi-user server (intermediate)
 
 You can run `solid` so that new users can sign up, in other words, get their WebIDs _username.yourdomain.com_.
@@ -116,9 +119,6 @@ $ solid start --multiuser --port 8443 --ssl-cert /path/to/cert --ssl-key /path/t
 
 Your users will have a dedicated folder under `./data` at `./data/<username>.<yourdomain.tld>`. Also, your root domain's website will be in `./data/<yourdomain.tld>`. New users can create accounts on `/api/accounts/new` and create new certificates on `/api/accounts/cert`. An easy-to-use sign-up tool is found on `/api/accounts`.
 
-### Running Solid behind a reverse proxy (such as NGINX)
-See [Running Solid behind a reverse proxy](https://github.com/solid/node-solid-server/wiki/Running-Solid-behind-a-reverse-proxy).
-
 ##### How can I send emails to my users with my Gmail?
 
 > To use Gmail you may need to configure ["Allow Less Secure Apps"](https://www.google.com/settings/security/lesssecureapps) in your Gmail account unless you are using 2FA in which case you would have to create an [Application Specific](https://security.google.com/settings/security/apppasswords) password. You also may need to unlock your account with ["Allow access to your Google account"](https://accounts.google.com/DisplayUnlockCaptcha) to use SMTP.