Go HTTP control server with restart openvpn route

- Fix #147
- Dockerfile updated
- Documentation updated
- Using contexts to restart openvpn
- Code foundation for more http routes

Dockerfile

@@ -85,7 +85,7 @@ ENV VPNSP="private internet access" \
     SHADOWSOCKS_PASSWORD= \
     SHADOWSOCKS_METHOD=chacha20-ietf-poly1305
 ENTRYPOINT /entrypoint
-EXPOSE 8888/tcp 8388/tcp 8388/udp
+EXPOSE 8000/tcp 8888/tcp 8388/tcp 8388/udp
 HEALTHCHECK --interval=3m --timeout=3s --start-period=20s --retries=1 CMD /entrypoint healthcheck
 RUN apk add -q --progress --no-cache --update openvpn ca-certificates iptables unbound tinyproxy tzdata && \
     echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories && \