remove duplicate readme

docs/readme.md

-# [Moodle Logstore xAPI](https://moodle.org/plugins/view/logstore_xapi)
-> Emits events from the [Moodle](https://moodle.org/) Logstore as [xAPI](https://github.com/adlnet/xAPI-Spec/blob/master/xAPI.md) statements.
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-[![Build Status](https://travis-ci.org/jlowe64/moodle-logstore_xapi.svg?branch=master)](https://travis-ci.org/jlowe64/moodle-logstore_xapi)
-[![Moodle Plugin Directory](http://img.shields.io/badge/moodle-plugin-orange.svg)](https://moodle.org/plugins/view/logstore_xapi)
-[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/LearningLocker/learninglocker?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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-- [Installation](installation.md)
-- [Report bugs, enhancements, and questions](../contributing.md#issue-templates)
-- [Supported events](events.md)
-- [Developer documentation](developers.md)
-- [Plugin design](design.md)