Remove legacy GitHub Action workflows

Conflicts with our newer pipeline when a tag is pushed.

.github/workflows/publish.yml

@@ -1,38 +0,0 @@
-name: Publish
-
-on:
-  push:
-    tags:
-      - 0.*
-
-jobs:
-  github-release:
-    runs-on: ubuntu-18.04
-    name: Publish GitHub Release
-    steps:
-      - uses: actions/checkout@master
-      - uses: actions/setup-python@v1
-        with:
-          python-version: 3.7
-          architecture: x64
-      - run: pip install wheel
-      - run: python setup.py sdist bdist_wheel
-      - uses: softprops/action-gh-release@v1
-        with:
-          files: dist/*
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-  pypi:
-    runs-on: ubuntu-18.04
-    name: Publish package on PyPI
-    steps:
-      - uses: actions/checkout@master
-      - uses: actions/setup-python@v1
-        with:
-          python-version: 3.7
-          architecture: x64
-      - run: pip install wheel
-      - run: python setup.py sdist bdist_wheel
-      - uses: pypa/gh-action-pypi-publish@master
-        with:
-          password: ${{ secrets.PYPI_TOKEN }}