touch up the instructions and config example

config/pyrom_config.toml.example

@@ -1,11 +1,31 @@
+### REQUIRED CONFIGURATION
+## the following settings are required.
+## the app will not work if they are missing.
+
+# the domain name you will be serving Pyrom from, without the scheme, including the subdomain(s).
+# this is overridden by the app in development.
+# used for generating URLs.
+# the app will not start if this field is missing.
+SERVER_NAME = "forum.your.domain"
+
+### OPTIONAL CONFIGURATION
+## the following settings are set to their default values.
+## you can override any of them.
+
+# your forum's name, shown on the header.
 SITE_NAME = "Pyrom"
-DISABLE_SIGNUP = false # if true, no one can sign up.
+
+# if true, users can not sign up manually. see the following two settings.
+DISABLE_SIGNUP = false
 
 # if neither of the following two options is true,
 # no one can sign up. this may be useful later when/if LDAP is implemented.
 
-MODS_CAN_INVITE = true # if true, allows moderators to create invite links. useless unless DISABLE_SIGNUP to be true.
-USERS_CAN_INVITE = false # if true, allows users to create invite links. useless unless DISABLE_SIGNUP to be true.
+# if true, allows moderators to create invite links. useless unless DISABLE_SIGNUP is true.
+MODS_CAN_INVITE = true
+
+# if true, allows users to create invite links. useless unless DISABLE_SIGNUP is true.
+USERS_CAN_INVITE = false
 
 # contact information, will be shown in /guides/contact
 # some babycodes allowed