Simplify packaging to use only pyproject.toml

- Remove duplicative setup.py file
- Remove requirements.txt (dependencies now in pyproject.toml)
- Update GitHub Actions workflow to install via pyproject.toml
- Clean modern packaging approach with no conflicts
- Successfully builds both sdist and wheel

Author: zoharbabin

.github/workflows/test-and-publish.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip setuptools wheel
-          pip install -r requirements.txt
+          pip install -e .
           pip install pytest
 
       - name: Run tests

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "github-org-stats"
-version = "1.0.0"
+version = "0.1.0"
 authors = [
     {name = "Open Source Contributors", email = "contributors@github-org-stats.org"},
 ]