Remove ldap auth

syncthing is fundamentally a single user app and it's confusing that
one can LDAP login giving the impression it is somehow multi-user.

Dockerfile

@@ -1,33 +1,6 @@
 FROM cloudron/base:0.10.0
 MAINTAINER Syncthing Developers <support@cloudron.io>
 
-EXPOSE 8000
-
-RUN apt-get update && apt-get -y install busybox
-
-ENV NGINX_VERSION=1.12.0
-ENV NGINX_LDAP_VERSION=b80942160417e95adbadb16adc41aaa19a6a00d9
-
-# Build a custom nginx with ldap support
-RUN apt-get remove -y nginx-full && apt-get autoremove -y && apt-get -y install libldap2-dev libpcre3-dev
-RUN mkdir -p /tmp/nginx-ldap
-WORKDIR /tmp/nginx-ldap
-RUN wget "https://github.com/kvspb/nginx-auth-ldap/archive/${NGINX_LDAP_VERSION}.tar.gz" -O - \
-    | tar -xz -C /tmp/nginx-ldap --strip-components=1
-
-RUN mkdir -p /tmp/nginx
-WORKDIR /tmp/nginx
-RUN wget "https://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz" -O - \
-    | tar -xz -C /tmp/nginx --strip-components=1
-RUN ./configure \
-    --add-dynamic-module=/tmp/nginx-ldap \
-    --modules-path=/usr/local/nginx/modules \
-    --conf-path=/app/code/nginx.conf \
-    --pid-path=/run/nginx.pid \
-    --error-log-path=/run/nginx.error.log \
-    --build=cloudron-river
-RUN make install
-
 ENV VERSION 0.14.44
 
 RUN mkdir -p /app/code \
@@ -36,8 +9,6 @@ RUN mkdir -p /app/code \
 
 WORKDIR /app/code
 
-ADD nginx.conf /app/code/nginx.conf
-ADD inittab /etc/inittab
 ADD start.sh /app/code/start.sh
 
 CMD [ "/app/code/start.sh" ]