remove these dockerfiles i don't use

base/centos-powershell/Dockerfile

@@ -1,5 +0,0 @@
-FROM centos:7
-
-RUN yum -y install https://github.com/PowerShell/PowerShell/releases/download/v6.0.0-alpha.9/powershell-6.0.0_alpha.9-1.el7.centos.x86_64.rpm
-
-CMD powershell

base/fedora-systemd/Dockerfile

@@ -1,15 +0,0 @@
-FROM fedora:23
-
-ENV container docker
-
-RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == systemd-tmpfiles-setup.service ] || rm -f $i; done); \
-    rm -f /lib/systemd/system/multi-user.target.wants/*; \
-    rm -f /etc/systemd/system/*.wants/*; \
-    rm -f /lib/systemd/system/local-fs.target.wants/*; \
-    rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
-    rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
-    rm -f /lib/systemd/system/basic.target.wants/*;\
-    rm -f /lib/systemd/system/anaconda.target.wants/*;
-
-VOLUME [ "/sys/fs/cgroup" ]
-CMD ["/usr/sbin/init"]

base/fedora-systemd/run.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-
-docker run --stop-signal=37 -ti -v /etc/machine-id:/etc/host-machine-id:ro -v /sys/fs/cgroup:/sys/fs/cgroup -v /tmp/$(mktemp -d):/run docker.io/xena/fedora-systemd

base/nim-0.14.2/Dockerfile

@@ -1,19 +0,0 @@
-FROM buildpack-deps:jessie
-MAINTAINER Cadey Dodrill <me@christine.website>
-
-RUN mkdir /nim -p
-WORKDIR /nim
-
-RUN wget http://nim-lang.org/download/nim-0.14.2.tar.xz \
- && tar xf nim-0.14.2.tar.xz \
- && mv nim-0.14.2 compiler \
- && cd compiler \
- && sh build.sh \
- && ln -s /nim/compiler/bin/nim /bin/nim \
- && cd .. \
- && rm nim-0.14.2.tar.xz \
- && git clone https://github.com/nim-lang/nimble.git \
- && cd nimble \
- && /nim/compiler/bin/nim -d:release c -r src/nimble -y install \
- && cd .. \
- && ln -s /nim/nimble/nimble /bin/nimble