MAINT: Rm duplicated contributing info from README.

Author: rossbar

README.md

@@ -25,141 +25,6 @@ or navigate to any of the documents listed below and download it individually.
 8. [Tutorial: Plotting Fractals](content/tutorial-plotting-fractals.ipynb)
 9. [Tutorial: Analysing the impact of the lockdown on air quality in Delhi, India](content/tutorial-air-quality-analysis.md)
 
-
-## Contributing
-
-We very much welcome contributions! If you have an idea or proposal for a new
-tutorial, please [open an issue](https://github.com/numpy/numpy-tutorials/issues)
-with an outline.
-
-Don’t worry if English is not your first language, or if you can only come up
-with a rough draft. Open source is a community effort. Do your best – we’ll help
-fix issues.
-
-Images and real-life data make text more engaging and powerful, but be sure what
-you use is appropriately licensed and available. Here again, even a rough idea
-for artwork can be polished by others.
-
-### Building the website
-
-```{note}
-The NumPy tutorials are powered by [`jupyter-book`][jb-docs] and the
-[`MyST` document engine][mystmd].
-See the linked documentation for further details.
-```
-
-[jb-docs]: https://jupyterbook.org/stable/
-[mystmd]: https://mystmd.org/
-
-#### Quickstart
-
-Set up a development environment with the dependencies listed in
-`requirements.txt` and `site/requirements.txt`.
-For example, using the built-in [`venv`][venv] module:
-
-```bash
-python -m venv np-tutorials
-source np-tutorials/bin/activate
-python -m pip install -r requirements.txt -r site/requirements.txt
-```
-
-[venv]: https://docs.python.org/3/library/venv.html
-
-The site can then be built with:
-
-```bash
-jupyter-book start --execute
-```
-
-This will execute all the notebooks and start a web server to view the rendered
-content locally.
-View the rendered site by opening the ``localhost:30xy`` in your preferred browser (the exact port number will be printed in your terminal).
-
-### Adding your own tutorials
-
-If you have your own tutorial in the form of a Jupyter notebook (a `.ipynb`
-file) and you'd like to add it to the repository, follow the steps below.
-
-
-#### Create an issue
-
-Go to [https://github.com/numpy/numpy-tutorials/issues](https://github.com/numpy/numpy-tutorials/issues)
-and create a new issue with your proposal. Give as much detail as you can about
-what kind of content you would like to write (tutorial, how-to) and what you
-plan to cover. We will try to respond as quickly as possible with comments, if
-applicable.
-
-#### Check out our suggested template
-
-You can use our [Tutorial Style Guide](content/tutorial-style-guide.md) to make
-your content consistent with our existing tutorials.
-
-#### Upload your content
-
-<ul>
-<details>
-    <summary>
-        <b>Fork this repository</b> (if you haven't before).
-    </summary>
-    <img src="site/_static/01-fork.gif" width=80% height=80%>
-</details>
-
-<details>
-    <summary>
-        <b>In your own fork, create a new branch for your content.</b>
-    </summary>
-    <img src="site/_static/02-create_new_branch.gif" width=80% height=80%>
-</details>
-
-<details>
-    <summary>
-        <b>Add your notebook to the <code>content/</code> directory.</b>
-    </summary>
-    <img src="site/_static/03-upload.gif" width=80% height=80%>
-</details>
-
-<b>Update the <code>environment.yml</code> file with the dependencies for your
-tutorial</b> (only if you add new dependencies).
-
-<details>
-    <summary>
-        <b>Update this <code>README.md</code> to include your new entry.</b>
-    </summary>
-    <img src="site/_static/04-add_to_readme.gif" width=80% height=80%>
-</details>
-
-<b>Update the attribution section (below) to credit the original tutorial
-author, if applicable.</b>
-
-<details>
-    <summary>
-        <b>Create a <a href="https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests">pull request.</a>
-        Make sure the "Allow edits and access to secrets by maintainers" option
-        is selected so we can properly review your submission.</b>
-    </summary>
-    <img src="site/_static/05-create_PR.gif" width=80% height=80%>
-</details>
-
-:tada: <b>Wait for review!</b>
-</ul>
-
-For more information about GitHub and its workflow, you can see
-[this document](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests).
-
-
-### Building the Sphinx site locally
-
-Building the tutorials website, which is published at
-https://github.com/numpy/numpy-tutorials, locally isn't necessary before making
-a contribution, but may be helpful:
-
-```bash
-conda env create -f environment.yml
-conda activate numpy-tutorials
-cd site
-make html
-```
-
 ## Translations
 
 While we don't have the capacity to translate and maintain translated versions