[keycloak-dev] Doc renaming and organization suggestion

[Bill Burke]

I suggest we rename Server Developer Guide to Keycloak (RH-SSO)
Developer Guide.  We move all programmer related SPIs, REST interface
docs (token exchange), Client Registration, adapter SPIs, really
anything a developer would do to this guide.

Securing Apps should be specifically configuration tasks for securing
an application.  Only things an admin would do and no developer
concerns should be there.

-- 
Bill Burke
Red Hat