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.

---

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[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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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