Summary:
- Remove unused server.ts
- Rename the configuration section `Erlang Language Platform` rather then `Example Extension`
- Rename the configuration settings used in the client only to have `elpClient` prefix
- Insert a configuration section for all currently accepted elp configurations.
- This is done by running `elp config > /tmp/config.json` and editing in the contents
Reviewed By: robertoaloi
Differential Revision: D56417232
fbshipit-source-id: 06cc5ab77c992514a5a445d5627313fdc04ae719