Update mxisd project description

supporting-docs/projects/2017-01-23-mxisd.md

@@ -8,16 +8,9 @@ maturity: Alpha
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 # {{ page.title }}
-mxisd is an implementation of the Matrix Identity Server which aims to provide an alternative to [sydent](https://github.com/matrix-org/sydent) and an external validation implementation of the [Identity Service API](http://matrix.org/docs/spec/identity_service/unstable.html).
+mxisd is a federated Matrix Identity Server following a cascading lookup model, using LDAP (optional) then other identity servers, including the central Matrix servers.  
+It is targeted to people/organisation that run their own Homeserver for a specific domain and want to publish 3PID mapping without having to rely on central servers.
 
-mxisd is currently in read-only mode and use a priority lookup strategy with several providers.
-
-Given the 3PID ```john.doe@example.org```, the following would be performed in priority order until a mapping is found:
-
-LDAP: lookup the Matrix ID from an configurable attribute.
-DNS: lookup another Identity Server using the domain part of an e-mail and:
-Look for a SRV record under ```_identity._matrix._tcp.example.org```
-Lookup using the base domain name ```example.org```
-Forwarder: Proxy the request to other identity servers (```matrix.org``` and ```vector.im``` currently hardcoded).
+Is is an implementation of the [Identity Service API](http://matrix.org/docs/spec/identity_service/unstable.html) which aims to provide an alternative to [sydent](https://github.com/matrix-org/sydent).
 
 Follow the progress and grab the code from [GitHub](https://github.com/kamax-io/mxisd).