Added figures to generated documentation

[jesper-friis]

Added figures to generated documentation. If the value of a property matches a regex for a figure on the web, it will be included in the documentation.

Further work: The figure size should probably be adjusted to not make the table too large. Probably preferred to only show a thumbnail-sized version of the figure in the table. The full size could be shown by clicking. Easier to play with in a following-up PR when this is applied to EMMO.

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Also, added prefLabel as anchoring points such that one can use the browser to easily get documentation of a concept one knows the prefLabel of.

For example, entering

https://w3id.org/emmo#Atom

should bring you to the section in the html doc that documents Atom.

Description

Type of change

• Bug fix.
• New feature.
• Documentation update.
• Test update.

Checklist

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 72.57%. Comparing base (5b6785f) to head (65b2fa6).

Files	Patch %	Lines
ontopy/ontodoc_rst.py	85.71%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #767      +/-   ##
==========================================
+ Coverage   72.52%   72.57%   +0.05%     
==========================================
  Files          18       18              
  Lines        3701     3716      +15     
==========================================
+ Hits         2684     2697      +13     
- Misses       1017     1019       +2     

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[francescalb]

I see no example or test.

At least I want t more through description in the code itself. E.g. adapt text in the PR comment and include it in the documentation.