4.1 improved build

Same code as 4.1 with improved builder (Dockerfile) that enable CD with sole hosting services

code cleanup, doc update

4.1

add screnshot

logger endpoint

added a logger endpoint writing to stdout.

flipflop healthcehck

• code reorg
• flip/flop healthcheck
• stamp on version endpoint

http mux + html moved to external template

0.4

build on centos

env parsing in separate package

0.3

doc typos

first working version

v0.1

first working version. quick and dirty