Setup docs

[fmigneault]

relates to #61

FYI @matprov @tomLandry
doc sections updated with placeholders for upcoming examples, usage details, etc.
feel free to add more info

[codecov]

Codecov Report

Merging #167 into master will decrease coverage by 0.02%.
The diff coverage is 72.22%.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   64.06%   64.04%   -0.03%     
==========================================
  Files          52       52              
  Lines        6879     6886       +7     
  Branches     1117     1118       +1     
==========================================
+ Hits         4407     4410       +3     
- Misses       2196     2199       +3     
- Partials      276      277       +1     

Impacted Files	Coverage Δ
weaver/processes/wps_workflow.py	0.00% <0.00%> (ø)
weaver/typedefs.py	0.00% <ø> (ø)
weaver/database/__init__.py	75.00% <50.00%> (-11.67%)	⬇️
weaver/wps_restapi/api.py	80.64% <100.00%> (+0.15%)	⬆️

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[fmigneault]

result:
https://pavics-weaver.readthedocs.io/en/setup-docs/