Rewriting ontodoc based on domain-battery (#742)

# Description
Rewriting and simplifying the ontodoc tool based on domain-battery. For now the python module is called ontodoc_rst.py.

For each module, document:
- classes
- object properties
- data properties
- annotation properties
- individuals
- datatypes

## Tasks done so far (see #759 for remaining tasks):
- [x] Reproduce all information included in the [battery.rst](https://github.com/emmo-repo/domain-battery/blob/master/sphinx/battery.rst) file
- [x] Add tooling for creating other needed files, like `index.rst` (just a template that the user can improve)
- [x] Add a new ontodoc script/tool - instead of adding a new tool, the old ontodoc tool was extended to support `.rst` output. It doesn't run sphinx automatically, though...

## Type of change
- [ ] Bug fix.
- [x] New feature.
- [ ] Documentation update.
- [x] Test update.

Co-authored-by: francescalb <[email protected]>

docs/api_reference/ontopy/ontodoc_rst.md

@@ -0,0 +1,3 @@
+# ontodoc_rst
+
+::: ontopy.ontodoc_rst

ontopy/__init__.py

@@ -23,4 +23,4 @@
 from owlready2 import onto_path
 
 
-__all__ = ("patch", "World", "get_ontology", "onto_path")
+__all__ = ("__version__", "World", "get_ontology", "onto_path")

ontopy/excelparser.py

@@ -652,6 +652,8 @@ def _add_entities(
         owlready2.DataPropertyClass,
     ]:
         rowheader = "subPropertyOf"
+    else:
+        raise TypeError(f"Unexpected `entitytype`: {entitytype!r}")
 
     # Dictionary with lists of entities that raise errors
     entities_with_errors = {