* [docs] Update contributing.md
- Add Pull Request process and guidelines.
- Add feature/bug issue process.
- Rearrange some sections for clarity.
- Add overview of package structure.
* [docs] Add build from source links
* [chore] add pull request templates
These link to the new CONTRIBUTING.md document, and include a checklist to validate that contributors have read the guidelines.
* [docs] Put existing stub CoC in separate doc
* update web related stuff in CONTRIBUTING.md
Co-authored-by: f0x <f0x@cthu.lu>
