add mirroring post and images for examples

i2p2www/blog/2019/06/02/mirroring-guide.rst

i2p2www/static/images/http-1-b.png

i2p2www/static/images/http-1.png

i2p2www/static/images/http-2.png

i2p2www/static/images/http-3-b.png

i2p2www/static/images/http-3.png

i2p2www/static/images/http-4.png

i2p2www/static/images/http-5.png

i2p2www/static/images/http-6.png

i2p2www/static/images/http-7.png

i2p2www/static/images/http-8.png

i2p2www/static/images/http-9.png