text-detection

Hi all,

We are asking for help from our community, hoping to provide Chinese documentation to all users. It's not difficult and here is the chance to be one of the contributors of MMOCR, an open-source rising star!

Here is a list of documentation needed to be translated:

• docs/getting_started.md
• [docs/ins

Following up on #968, I just realized that there is no section for artefact detection in the documentation.
While the object detection module for this is only available in PyTorch for now, I'd argue we could document the OpenCV wrap we made a long time ago!

Here is the section to document: https://github.com/mindee/doctr/tree/main/doctr/models/artefacts

Here is what I propose:

• Added