Clean up after rename (#26)

* Fix workflow input called 'project' to use empty string as default value
* Delete old files that has been replaced:
  * build-documentation.yml --> convert-markdown.yml
  * sample-call-build-documenation.yml  --> README.md in root
  * sample-call-convert-markdown.yaml  --> README.md in root
  * build-docs.ps1 --> mdconvert.ps1
  * cover.png --> designdoc-cover.png
  * logo.png --> designdoc-logo.png
  * azure-document.yaml --> mdconvert.ps1
  * azure-document.tex --> designdoc.tex
* Delete action files to sync labels because we can use github-governance automation instead:
  * push-labels-sync.yaml
  * labels.yaml
* Use consistent extension .yml instead of .yaml
* Add .gitignore and CODEOWNERS files
* Change vscode settings
* Update README.md

.github/labeler.yaml → .github/labeler.yml

@@ -11,4 +11,4 @@ area/documentation:
   - "docs/**/*"
 area/definitions:
   - "examples/**/*"
-  - "*.tf"
+  - "*.tf"