Update docker instructions

[ahartikainen]

Description

Update docker functionality.

• new requirements files
• updated instructions for docs build
• some small additions to contributing guide
• deleted travis related scripts

Checklist

• New features are properly documented (with an example if appropriate)?
• Changes are listed in changelog

[codecov]

Codecov Report

Merging #1127 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1127      +/-   ##
==========================================
+ Coverage   92.79%   92.81%   +0.01%     
==========================================
  Files          93       93              
  Lines        9158     9181      +23     
==========================================
+ Hits         8498     8521      +23     
  Misses        660      660              

Impacted Files	Coverage Δ
arviz/plots/traceplot.py	97.33% <0.00%> (-1.26%)	⬇️
arviz/plots/backends/bokeh/traceplot.py	95.97% <0.00%> (-0.43%)	⬇️
arviz/plots/backends/matplotlib/traceplot.py	99.15% <0.00%> (+0.06%)	⬆️
arviz/plots/backends/bokeh/rankplot.py	93.33% <0.00%> (+1.66%)	⬆️
arviz/plots/rankplot.py	91.66% <0.00%> (+2.77%)	⬆️

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[ahartikainen]

Can someone try this?

[ahartikainen]

ok, I have updated Docker + container.

This now works with Windows too, I created powershell script to do the same stuff as sh file does.

powershell -File ./scripts/container.ps1 --clear-cache --shell

I also added jupyter notebook / lab so these could work

./scripts/container.sh --notebook
./scripts/container.sh --lab

There is also now docs building steps in the default environment. I think we could drop the environment and just use the default namespace? Or maybe it is better to stay in environment.