remove unused actions

.github/workflows/documentation.yml

-# Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
-
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to
-# deal in the Software without restriction, including without limitation the
-# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-# sell copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-# IN THE SOFTWARE.
-
-name: documentation
-on:
-  push:
-    branches:
-      - master
-
-env:
-  PYTHON_VERSION: 3.x
-
-permissions:
-  contents: write
-
-jobs:
-  documentation:
-    name: Build documentation
-    runs-on: ubuntu-latest
-    steps:
-
-      - name: Checkout repository
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-
-      - name: Set up Python runtime
-        uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-
-      - name: Set up build cache
-        uses: actions/cache@v3
-        id: cache
-        with:
-          key: ${{ runner.os }}-${{ hashFiles('.cache/**') }}
-          path: .cache
-
-      - name: Install dependencies
-        run: sudo apt-get install pngquant
-
-      - name: Install Python dependencies
-        run: |
-          pip install \
-            "cairosvg>=2.5" \
-            "mkdocs-git-committers-plugin-2>=1.1.1" \
-            "mkdocs-git-revision-date-localized-plugin>=1.0" \
-            "mkdocs-minify-plugin>=0.3" \
-            "mkdocs-rss-plugin>=1.2" \
-            "mkdocs-redirects>=1.0" \
-            "pillow<10"
-
-      - name: Install Insiders build
-        if: github.event.repository.fork == false
-        env:
-          GH_TOKEN: ${{ secrets.GH_TOKEN }}
-        run: |
-          # Warning: please don't use this method when installing Insiders from
-          # CI! We have to do it this way in order to allow for overrides on our
-          # own documentation, but you should stick to the method we recommend
-          # in the publishing guide – see https://bit.ly/3zjdJtw
-          git clone --depth 1 https://${GH_TOKEN}@github.com/squidfunk/mkdocs-material-insiders.git
-          pip install -e mkdocs-material-insiders
-          cp mkdocs-material-insiders/mkdocs.yml mkdocs.yml
-          rm -rf material
-          cp -r mkdocs-material-insiders/material material
-
-      - name: Deploy documentation
-        env:
-          GH_TOKEN: ${{ secrets.GH_TOKEN }}
-          GOOGLE_ANALYTICS_KEY: ${{ secrets.GOOGLE_ANALYTICS_KEY }}
-        run: |
-          mkdocs gh-deploy --force
-          mkdocs --version