Update docs with better config + installation instructions (#300)

* start reworking some documentation

* fuller documentation  + better docs structure

docs/configuration/accounts.md

@@ -0,0 +1,27 @@
+# Accounts
+
+## Settings
+
+```yaml
+###########################
+##### ACCOUNTS CONFIG #####
+###########################
+
+# Config pertaining to creation and maintenance of accounts on the server, as well as defaults for new accounts.
+accounts:
+
+  # Bool. Do we want people to be able to just submit sign up requests, or do we want invite only?
+  # Options: [true, false]
+  # Default: true
+  openRegistration: true
+
+  # Bool. Do sign up requests require approval from an admin/moderator before an account can sign in/use the server?
+  # Options: [true, false]
+  # Default: true
+  requireApproval: true
+
+  # Bool. Are sign up requests required to submit a reason for the request (eg., an explanation of why they want to join the instance)?
+  # Options: [true, false]
+  # Default: true
+  reasonRequired: true
+```