docs: Move CONTRIBUTING.md to the root folder

.github/PULL_REQUEST_TEMPLATE.md

@@ -24,7 +24,7 @@
 
 ## Checklist
 
-- [ ] I read the [Contributor Guide](../doc/CONTRIBUTING.md) and followed the process outlined there for submitting PRs.
+- [ ] I read the [Contributor Guide](../CONTRIBUTING.md) and followed the process outlined there for submitting PRs.
 - [ ] I titled the PR using [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0).
 - [ ] I did not modify the `CHANGELOG.md` nor the plugin version in `pubspec.yaml` files.
 - [ ] All existing and new tests are passing.

README.md

@@ -356,7 +356,7 @@ Made with [contrib.rocks](https://contrib.rocks).
 
 We welcome contributions!
 
-Please follow these guidelines when contributing to the project. See [CONTRIBUTING.md](./doc/CONTRIBUTING.md) for more details. <br>
+Please follow these guidelines when contributing to the project. See [CONTRIBUTING.md](./CONTRIBUTING.md) for more details. <br>
 
 We must mention that the `CONTRIBUTING.md` have a development notes, so if you planning on contribtuing to the repo, please read it.
 

flutter_quill_extensions/README.md

@@ -239,7 +239,7 @@ OnDragDoneCallback get _onDragDone {
 
 We welcome contributions!
 
-Please follow these guidelines when contributing to our project. See [CONTRIBUTING.md](./../doc/CONTRIBUTING.md) for more details.
+Please follow these guidelines when contributing to our project. See [CONTRIBUTING.md](../CONTRIBUTING.md) for more details.
 
 ## License
 

flutter_quill_test/README.md

@@ -38,7 +38,7 @@ await tester.quillEnterText(find.byType(QuillEditor), 'test\n');
 
 We welcome contributions!
 
-Please follow these guidelines when contributing to our project. See [CONTRIBUTING.md](./../doc/CONTRIBUTING.md) for more details.
+Please follow these guidelines when contributing to our project. See [CONTRIBUTING.md](../CONTRIBUTING.md) for more details.
 
 ## License