Move docker files into subdir

docker/Dockerfile

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+FROM nginx:alpine
+
+# Replace default config.
+RUN  rm /etc/nginx/conf.d/default.conf
+COPY nginx.conf /etc/nginx/conf.d/auth.conf
+
+# Add user credentials.
+COPY nginx.htpasswd /etc/nginx/auth.htpasswd
+

docker/install.sh

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+#!/bin/bash
+
+# Build the notes-server image.
+docker build --no-cache -t notes-server .
+
+# Run the notes-server image.
+docker run -d \
+  --name notes-server \
+  -v "/var/www/html/notes/hugo/public:/usr/share/nginx/html" \
+  -p 42069:80 \
+  notes-server
+
+# Install and enable the systemctl service.
+cp notes.service /etc/systemd/system/notes.service
+systemctl enable notes.service

docker/nginx.conf

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+server {
+    listen 80 default_server;
+    root "/usr/share/nginx/html";
+
+    location / {
+        auth_basic              "Restricted";
+        auth_basic_user_file    auth.htpasswd;
+    }
+}

docker/notes.service

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+[Unit]
+Description=Notes server
+After=docker.service
+Wants=network-online.target docker.socket
+Requires=docker.socket
+
+[Service]
+ExecStart=/usr/bin/docker start -a notes-server
+ExecStop=/usr/bin/docker stop -t 10 notes-server
+Restart=always
+
+[Install]
+WantedBy=multi-user.target

docker/passwd.sh

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+#!/bin/bash
+
+# htpasswd from package apache2-utils
+htpasswd -nb $1 $2 > nginx.htpasswd