mediawiki: remove README.md

mediawiki/README.md

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-## wonderfall/freshrss
-
-A free, self-hostable aggregator : https://github.com/FreshRSS/FreshRSS
-
-#### Features
-- Based on Alpine Linux (wonderfall/nginx-php image)
-- Bundled with nginx and PHP7.1.
-- Automatic feed update (frequency at 30 minutes by default)
-
-#### Build-time variables
-- **FRESHRSS_VER** : version of FreshRSS
-
-#### Environment variables
-- **UID** : user id
-- **GID** : group id
-- **MEMORY_LIMIT** : php memory limit *(default : 128M)*
-- **UPLOAD_MAX_SIZE** : maximum upload size *(default : 10M)*
-- **CRON_PERIOD** : feed update frequency *(default : 30m)*
-
-#### Volumes
-- **/freshrss/data**
-
-#### Ports
-- **8888** [(reverse proxy!)](https://github.com/hardware/mailserver/wiki/Reverse-proxy-configuration)