A monolithic Dockerfile that actually works

[ibnesayeed]

This implements #70. Running this should be as simple as:

$ docker image build -t ipwb .
$ docker container run -it --rm -v 5000:5000 ipwb

[codecov]

Codecov Report

Merging #351 into master will decrease coverage by 0.92%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #351      +/-   ##
==========================================
- Coverage   24.31%   23.38%   -0.93%     
==========================================
  Files           6        6              
  Lines        1024     1193     +169     
  Branches      157      235      +78     
==========================================
+ Hits          249      279      +30     
- Misses        759      890     +131     
- Partials       16       24       +8

Impacted Files	Coverage Δ
ipwb/replay.py	14.38% <0%> (+0.99%)	⬆️

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[machawk1]

LGTM, closes #70. Thanks again for your recent cycles getting ipwb into better shape.