Related to #1365
Implement CI to automate heavy PR load using `awesome-lint`.
* **.github/workflows/main.yml**
- Add a step to run `awesome-lint` on `readme.md` after the checkout step.
* **.github/workflows/repo_linter.sh**
- Add `npx awesome-lint` command to lint the repository after cloning.
* **readme.md**
- Mention the usage of `awesome-lint` for CI in the introduction.
- Add a section about `awesome-lint` in the "Contribution guide".
* **contributing.md**
- Add instructions for running `awesome-lint` before submitting a PR.
- Mention the requirement to pass `awesome-lint` in the PR guidelines.
