Jupytext

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**Fixed**
- The `text_representation` metadata of text notebooks is filtered from `.ipynb` files both in `jupytext.write` and in the contents manager for Jupyter ([900](https://github.com/mwouts/jupytext/issues/900))

**Changed**
- Jupytext will not issue a warning when a format suffix starting with '.', '-' or '_' is passed to the `--to` option ([901](https://github.com/mwouts/jupytext/issues/901))

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**Fixed**
- Jupytext will not open a text notebook that is not UTF-8 ([896](https://github.com/mwouts/jupytext/issues/896))

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**Changed**
- The test suite filters the warnings that don't belong to Jupytext ([823](https://github.com/mwouts/jupytext/issues/823))

**Fixed**
- The parsing of notebooks that don't have a YAML header (like `docs/formats.md`) was improved.
- The test suite works with `pytest-randomly` ([838](https://github.com/mwouts/jupytext/issues/838))

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**Changed**
- The "Jupytext Notebook" factory that lets the user configure the Notebook viewer as the default for text notebooks accepts more filetypes: "myst", "r-markdown" and "quarto" ([803](https://github.com/mwouts/jupytext/issues/803))
- Empty MyST Markdown files are valid notebooks ([883](https://github.com/mwouts/jupytext/issues/883))
- Jupytext also works with `markdown-it-py` v2.0 ([885](https://github.com/mwouts/jupytext/issues/885))

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**Changed**
- The extension for Jupyter Lab benefited from a series of improvements contributed by [Frédéric Collonval](https://github.com/fcollonval):
- A new "Jupytext Notebook" factory offers the option to open text notebooks directly with the notebook view ([803](https://github.com/mwouts/jupytext/issues/803)). To use it, follow the instructions in the [documentation](https://github.com/mwouts/jupytext/blob/main/docs/index.md#Install).
- The ICommandPalette is optional, for compatibility with RISE within JupyterLab [RISE[605](https://github.com/mwouts/jupytext/issues/605)](https://github.com/damianavila/RISE/pull/605)
- Added support for translation
- Branch `master` was renamed to `main` (links in the documentation were updated)

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**Fixed**
- The magic commands in `py:percent` scripts with no explicit format information remain commented over a round trip ([848](https://github.com/mwouts/jupytext/issues/848))