[ENH] Ontology widget documentation

[PrimozGodec]

Issue

The ontology widget is missing the documentation

Description of changes

Add documentation for the ontology widget

Includes

• Code changes
• Tests
• Documentation

[ajdapretnar]

I was planning to do this, but not before Ontology is a bit more stable. For instance, #832 and #824.

[ajdapretnar]

Add which formats are supported.

[PrimozGodec]

Done

[codecov-commenter]

Codecov Report

Merging #881 (a8d49b0) into master (60bc8ff) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head a8d49b0 differs from pull request most recent head 9f2aa2a. Consider uploading reports for the commit 9f2aa2a to get more accurate results

@@            Coverage Diff             @@
##           master     #881      +/-   ##
==========================================
- Coverage   76.97%   76.94%   -0.03%     
==========================================
  Files          85       85              
  Lines       11954    11960       +6     
  Branches     1877     1881       +4     
==========================================
+ Hits         9201     9203       +2     
- Misses       2449     2451       +2     
- Partials      304      306       +2     

[PrimozGodec]

I was planning to do this, but not before Ontology is a bit more stable. For instance, #832 and #824.

I started to work on it since on MJU they said that they need it to finish the project.
Regarding the issues:
#832 - this one is a really difficult one since it is caused by some unexpected behaviour by PyQT. I will continue working on it but haven't had enough time yet.
#824 - is also waiting because of me not having enough time

[PrimozGodec]

Before we merge it, I would just as @djukicn to:

• add a short sentence of the score in point 5
• check whether information regarding the generation of the ontology is correct
• Maybe add some additional information on how ontologies are generated

[ajdapretnar]

@PrimozGodec I am sorry I didn't check this yesterday, but you need to add ontology.md to index.rst and re-create widgets.json.