dev-docs: refactor and add information for newbies (#1912)

* refactor dev-docs structure and add information

* improve doc

* Update dev-docs/workflows/create-debug-cluster.md

Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>

* Update dev-docs/workflows/create-debug-cluster.md

Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>

* pr feedback daniel

* Update dev-docs/README.md

Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>

* move to howto again

* split up dev-setup and pull-request into sep files

* fix backticks

* add writing style convention + testing repo

* remove OSS cluster + reduce plugins vs code

* update bazel pre-pr doc

* ghcr img private hint

* add fetch measurement + provider sub-directory hint

* add label doc + pr title check in template

* add OSS build comment

* Update CONTRIBUTING.md

Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>

* Update CONTRIBUTING.md

Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>

* Update dev-docs/README.md

Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>

* Update dev-docs/workflows/dev-setup.md

Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>

* thomas feedback

* add go proverb mention

---------

Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>
Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>

dev-docs/workflows/upgrade-kubernetes.md

@@ -49,4 +49,4 @@ Normally renovate will handle the upgrading of Kubernetes dependencies.
 
 - Conduct e2e tests
   - [Run the sonobuoy test suite against your branch](https://sonobuoy.io/)
-  - [Run CI e2e tests](/.github/docs/README.md)
+  - [Run CI e2e tests](github-actions.md)