docs: Clean-up index.md (#2422)

Clean up index.md, updating the screenshot to a modern SolaraViz one and removing unnecessary information, leading to a clean landing page.

Author: EwoutH

docs/images/Mesa_Screenshot.png

@@ -13,82 +13,60 @@
 ```
 
 ```{image} https://img.shields.io/matrix/project-mesa:matrix.org?label=chat&logo=Matrix
-:target: https://matrix.to/#/#project-mesa:matrix.orgs
+:target: https://matrix.to/#/#project-mesa:matrix.org
 ```
 
 [Mesa] is an Apache2 licensed agent-based modeling (or ABM) framework in Python.
 
-The original conference paper is [available here](http://conference.scipy.org.s3-website-us-east-1.amazonaws.com/proceedings/scipy2015/jacqueline_kazil.html).
-
 Mesa allows users to quickly create agent-based models using built-in core components (such as spatial grids and agent schedulers) or customized implementations; visualize them using a browser-based interface; and analyze their results using Python's data analysis tools. Its goal is to be the Python-based counterpart to NetLogo, Repast, or MASON.
 
-
-![A screenshot of the Schelling Model in Mesa|100%](https://raw.githubusercontent.com/projectmesa/mesa/main/docs/images/Mesa_Screenshot.png)
-
-
-*Above: A Mesa implementation of the Schelling segregation model,
-being visualized in a browser window and analyzed in a Jupyter
-notebook.*
+![A screenshot of the Wolf Sheep model in Mesa|100%](images/wolf_scheep.png)
+*A visualisation of the Wolf Sheep model build with Mesa.*
 
 ## Features
 
-- Modular components
-- Browser-based visualization
-- Built-in tools for analysis
+- Built-in core modeling components
+- Flexible agent and model management through AgentSet
+- Browser-based Solara visualization
+- Built-in tools for data collection and analysis
+- Example model library
 
 ## Using Mesa
+### Installation Options
 
 To install our latest stable release (2.4.x), run:
 
-``` bash
+```bash
 pip install -U mesa
 ```
 
-Mesa >= 3.0 beta includes several installations options:
+To install our latest Mesa 3.0 beta with recommended dependencies:
 
-``` bash
+```bash
 pip install -U --pre mesa[rec]
 ```
-**mesa[rec]** (recommend install) installs - mesa, [networkx](https://networkx.org/), [matplotlib](https://matplotlib.org/stable/install/index.html)
-and [solara](https://solara.dev/)
-
-### Other installation options include:
-
-- **mesa[network]** installs mesa and [networkx](https://networkx.org/)
-- **mesa[viz]** installs, mesa, [matplotlib](https://matplotlib.org/stable/install/index.html) and [solara](https://solara.dev/)
-- **mesa[dev]** installs mesa[rec], [ruff](https://docs.astral.sh/ruff/), [pytest](https://docs.pytest.org/en/stable/), [pytest-cov](https://pytest-cov.readthedocs.io/en/latest/), [sphinx](https://www.sphinx-doc.org/en/master/man/sphinx-build.html#cmdoption-sphinx-build-e), [pytest-mock](https://pytest-mock.readthedocs.io/en/latest/)
-- **mesa[examples]** installs mesa[rec], [pytest](https://docs.pytest.org/en/stable/), and [scipy](https://scipy.org/)
-- **mesa[docs]** installs mesa[rec], [sphinx](https://www.sphinx-doc.org/en/master/man/sphinx-build.html#cmdoption-sphinx-build-e), [ipython](https://ipython.readthedocs.io/en/stable/install/kernel_install.html), [pydata_sphinx_theme](https://pydata-sphinx-theme.readthedocs.io/en/stable/),
-[seaborn](https://seaborn.pydata.org/), [myst-nb](https://myst-nb.readthedocs.io/en/latest/), [myst-parser](https://myst-parser.readthedocs.io/en/latest/)
-
-Then mesa[all] installs all these sub installation options:
-**mesa[all]** = mesa[network,viz,dev,examples,docs]
-
-For more help on using Mesa, check out the following resources:
-
-- [Mesa Overview]
-- [Mesa Introductory Tutorial]
-- [Mesa Visualization Tutorial]
-- [Mesa Examples]
-- [GitHub Issue Tracker]
-- [Matrix chat room]
-- [PyPI]
 
-## Contributing back to Mesa
+### Resources
 
-If you run into an issue, please file a [ticket] for us to discuss. If possible, follow up with a pull request.
+For help getting started with Mesa, check out these resources:
 
-If you would like to add a feature, please reach out via [ticket] or the [email list] for discussion. A feature is most likely to be added if you build it!
+- [Mesa Overview] - Learn about Mesa's core concepts and components
+- [Mesa Introductory Tutorial] - Build your first agent-based model
+- [Mesa Visualization Tutorial] - Learn how to create interactive visualizations with Solara
+- [Migration Guide] - Upgrade to Mesa 3.0
+- [Mesa Examples] - Browse user-contributed models and implementations
+- [GitHub Discussions] - Ask questions and discuss Mesa
+- [Matrix Chat Room] - Real-time chat with the Mesa community
 
-- [Contributors guide]
-- [Github]
+### Development and Support
 
-## Mesa Packages
+Mesa is an open source project and welcomes contributions:
 
-ABM features users have shared that you may want to use in your model
+- [GitHub Repository] - Access the source code
+- [Issue Tracker] - Report bugs or suggest features
+- [Contributors Guide] - Learn how to contribute
 
-- [See the Packages](https://github.com/projectmesa/mesa/wiki)
-- {ref}`Mesa-Packages <packages>`
+The original Mesa conference paper is [available here](http://conference.scipy.org.s3-website-us-east-1.amazonaws.com/proceedings/scipy2015/jacqueline_kazil.html).
 
 ```{toctree}
 :hidden: true
@@ -112,13 +90,13 @@ Mesa Packages <packages>
 - {ref}`search`
 
 [contributors guide]: https://github.com/projectmesa/mesa/blob/main/CONTRIBUTING.md
-[github]: https://github.com/projectmesa/mesa/
-[github issue tracker]: https://github.com/projectmesa/mesa/issues
+[github repository]: https://github.com/projectmesa/mesa/
+[github discussions]: https://github.com/projectmesa/mesa/discussions
+[issue tracker]: https://github.com/projectmesa/mesa/issues
 [matrix chat room]: https://matrix.to/#/#project-mesa:matrix.org
 [mesa]: https://github.com/projectmesa/mesa/
 [mesa overview]: overview
 [mesa examples]: https://github.com/projectmesa/mesa-examples
 [mesa introductory tutorial]: tutorials/intro_tutorial
 [mesa visualization tutorial]: tutorials/visualization_tutorial
-[pypi]: https://pypi.python.org/pypi/Mesa/
-[ticket]: https://github.com/projectmesa/mesa/issues
+[migration guide]: migration_guide