Restructure pipelines and badges

- Seperate test pipeline into E2E, integration and unit test pipelines.
- Improve documenetation for pipelines (ci-cd.md).
- Introduce naming convention for worklow files and names.
- Center badges with multiple files on README file.

.github/workflows/release.git.yaml

@@ -0,0 +1,17 @@
+name: git-release
+
+on:
+  push: # Ensure a new release is created for each new tag
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  bump-version-and-release:
+    if: github.event.base_ref == 'refs/heads/master'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: undergroundwires/bump-everywhere@master
+        with:
+          user: undergroundwires-bot
+          release-token: ${{ secrets.BUMP_GITHUB_PAT }} # Does not trigger release pipeline if we use default token: https://github.community/t5/GitHub-Actions/Github-Action-trigger-on-release-not-working-if-releases-was/td-p/34559
+                                                        # GitHub does not inject secrets if pipeline runs from fork or a fork is merged to main repo.