update dockerfiles, clean up

unmaintained/rainloop/README.md

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+## wonderfall/rainloop
+
+![](https://i.goopics.net/nI.png)
+
+#### What is this?
+Rainloop is a simple, modern & fast web-based client. More info on the [official website](http://www.rainloop.net/).
+
+#### Features
+- Based on Alpine 3.3
+- Latest Rainloop **Community Edition**
+- Contacts (DB) : sqlite, or mysql (server not built-in)
+- nginx + PHP7
+
+#### Build-time variables
+- **GPG_rainloop** : fingerprint of signing key
+
+#### Environment variables
+- **GID** : rainloop group id *(default : 991)*
+- **UID** : rainloop user id *(default : 991)*
+
+#### Volumes
+- **/rainloop/data** : data files.
+
+#### Ports
+- **8888***
+
+#### Reverse proxy
+https://github.com/Wonderfall/dockerfiles/tree/master/reverse
+https://github.com/hardware/mailserver/wiki/Reverse-proxy-configuration