removed unneeded workflow demo.yaml (#175)

Removed the demo.yaml

Reviewed-on: #175
Co-authored-by: Markus Rosenstihl <markus.rosenstihl@pkm.tu-darmstadt.de>
Co-committed-by: Markus Rosenstihl <markus.rosenstihl@pkm.tu-darmstadt.de>

.gitea/workflows/demo.yaml

@@ -1,23 +0,0 @@
-name: Gitea Actions Demo
-run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
-on: [push]
-
-jobs:
-  Explore-Gitea-Actions:
-    runs-on: bullseye
-    steps:
-      - run: echo "🎉 The job was automatically triggered by a ${{ gitea.event_name }} event."
-      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by Gitea!"
-      - run: echo "🔎 The name of your branch is ${{ gitea.ref }} and your repository is ${{ gitea.repository }}."
-      - name: Check out repository code
-        uses: actions/checkout@v3
-      - run: echo "💡 The ${{ gitea.repository }} repository has been cloned to the runner."
-      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
-      - name: List files in the repository
-        run: |
-          ls -la ${{ gitea.workspace }}
-      - name: Show vars
-        run: env
-        env:
-          GPG_KEYGRIP: GPG_KEYGRIP
-      - run: echo "🍏 This job's status is ${{ job.status }}."