docs(gitbook): try out generated docs

docs/plugins/email-composer/README.md

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+<a style="float:right;font-size:12px;" href="http://github.com/danielsogl/awesome-cordova-plugins/edit/master/src/@awesome-cordova-plugins/plugins/email-composer/index.ts#L48">
+  Improve this doc
+</a>
+
+# Email Composer
+
+```
+$ ionic cordova plugin add cordova-plugin-email-composer
+$ npm install @ionic-native/plugins/email-composer
+```
+
+## [Usage Documentation](https://ionicframework.com/docs/native/email-composer/)
+
+Plugin Repo: [https://github.com/katzer/cordova-plugin-email-composer](https://github.com/katzer/cordova-plugin-email-composer)
+
+Requires Cordova plugin: cordova-plugin-email-composer. For more info, please see the [Email Composer plugin docs](https://github.com/hypery2k/cordova-email-plugin).
+
+## Supported platforms
+
+- Amazon Fire OS
+  - Android
+  - Browser
+  - iOS
+  - Windows
+  - macOS