Removed conda, updated docs workflow, updated docs

[alkidbaci]

Removed conda and unused files

• Removed files: environment.yml, tox.ini, setup.cfg, .mailmap, MANIFEST.in
• Added all dependenices in requirement.txt
• Updated README.md

Updated docs workflow and build approach

• tox removed from dependencies, we use sphinx directly to build docs now.
• installed sphinx-autoapi to build the api automatically for ontolearn and owlapy based on docstrings.
• updated docs/conf.py, docs/index.rst and .github/workflows/docs.yml accordingly.

Updated dependenices

• increased the minimum version of some dependencies so they don't conflict each other and some for security reasons.
• added sphinx-autoapi
• removed tox, sphinxext-autox , tokenizers (since it is installed together with transformers) and parsimonious.

Updated documentation

• updated installation guide.
• references for owlapy api now target owlapy api and not owlapy repo.