Refactor LDAP config

* Move credentials to ENV vars in prod
* Use same configs in dev and prod
* Make UID attribute and admin DN configurable

.env.example

@@ -29,8 +29,12 @@
 
 # LDAP_HOST=localhost
 # LDAP_PORT=389
+# LDAP_USE_TLS=false
+# LDAP_UID_ATTR=cn
+# LDAP_BASE="ou=kosmos.org,cn=users,dc=kosmos,dc=org"
+# LDAP_ADMIN_USER="cn=Directory Manager"
 # LDAP_ADMIN_PASSWORD=passthebutter
-# LDAP_SUFFIX='dc=kosmos,dc=org'
+# LDAP_SUFFIX="dc=kosmos,dc=org"
 
 # REDIS_URL='redis://localhost:6379/1'