Remove core examples from mesa-examples (#225)

This PR:
- Removes the 9 core examples from this repo
- Updates the Readme to reflect that.

The following examples are moved (to [`examples`](https://github.com/projectmesa/mesa/tree/main/examples)):
- Basic Examples
  - Boltzmann Wealth
  - Boid Flockers
  - Conway's Game of Life
  - Virus on Network
  - Schelling Segregation
- Advanced Examples
  - Epstein Civil Violence
  - Sugarscape with Traders
  - Wolf-Sheep Predation
  - Demographic Prisoner's Dilemma on Grid

Part of projectmesa/mesa#2364.

README.md

@@ -1,6 +1,11 @@
 # Mesa Examples
+## Core Mesa examples
+The core Mesa examples are available at the main Mesa repository: https://github.com/projectmesa/mesa/tree/main/examples
 
-This repository contains examples that work with Mesa and illustrate different features of Mesa. For more information on each model, see its own Readme and documentation.
+Those core examples are fully tested, updated and guaranteed to work with the Mesa release that they are included with. They are also included in the Mesa package, so you can access them directly from your Python environment.
+
+## Mesa user examples
+This repository contains user examples and showcases that illustrate different features of Mesa. For more information on each model, see its own Readme and documentation.
 
 - Mesa examples that work on the Mesa and Mesa-Geo main development branches are available here on the [`main`](https://github.com/projectmesa/mesa-examples) branch.
 - Mesa examples that work with Mesa 2.x releases and Mesa-Geo 0.8.x releases are available here on the [`mesa-2.x`](https://github.com/projectmesa/mesa-examples/tree/mesa-2.x) branch.
@@ -39,18 +44,10 @@ Table of Contents
 
 A highly abstracted, simplified model of an economy, with only one type of agent and a single bank representing all banks in an economy.
 
-### [Boltzmann Wealth Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/boltzmann_wealth_model)
-
-Completed code to go along with the [tutorial](https://mesa.readthedocs.io/en/latest/tutorials/intro_tutorial.html) on making a simple model of how a highly-skewed wealth distribution can emerge from simple rules.
-
 ### [Color Patches Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/color_patches)
 
 A cellular automaton model where agents opinions are influenced by that of their neighbors. As the model evolves, color patches representing the prevailing opinion in a given area expand, contract, and sometimes disappear.
 
-### [Conway's Game Of "Life" Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/conways_game_of_life)
-
-Implementation of [Conway's Game of Life](https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life), a cellular automata where simple rules can give rise to complex patterns.
-
 ### [Conway's Game Of "Life" Model (Fast)](https://github.com/projectmesa/mesa-examples/tree/main/examples/conways_game_of_life_fast)
 
 A very fast performance optimized version of Conway's Game of Life using the Mesa [`PropertyLayer`](https://github.com/projectmesa/mesa/pull/1898). About 100x as fast as the regular versions, but limited visualisation (for [now](https://github.com/projectmesa/mesa/issues/2138)).
@@ -59,14 +56,6 @@ A very fast performance optimized version of Conway's Game of Life using the Mes
 
 Conway's game of life on a hexagonal grid.
 
-### [Demographic Prisoner's Dilemma on a Grid](https://github.com/projectmesa/mesa-examples/tree/main/examples/pd_grid)
-
-Grid-based demographic prisoner's dilemma model, demonstrating how simple rules can lead to the emergence of widespread cooperation -- and how a model activation regime can change its outcome.
-
-### [Epstein Civil Violence Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/epstein_civil_violence)
-
-Joshua Epstein's [model](http://www.uvm.edu/~pdodds/files/papers/others/2002/epstein2002a.pdf) of how a decentralized uprising can be suppressed or reach a critical mass of support.
-
 ### [Forest Fire Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/forest_fire)
 
 Simple cellular automata of a fire spreading through a forest of cells on a grid, based on the NetLogo [Fire](http://ccl.northwestern.edu/netlogo/models/Fire) model.
@@ -75,49 +64,23 @@ Simple cellular automata of a fire spreading through a forest of cells on a grid
 
 This project is an agent-based model implemented using the Mesa framework in Python. It simulates market dynamics based on Hotelling's Law, exploring the behavior of stores in a competitive market environment. Stores adjust their prices and locations if it's increases market share to maximize revenue, providing insights into the effects of competition and customer behavior on market outcomes.
 
-### [Schelling Segregation Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/schelling)
-
-Mesa implementation of the classic [Schelling segregation](http://nifty.stanford.edu/2014/mccown-schelling-model-segregation/) model.
-
-### [Sugarscape Constant Growback Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/sugarscape_cg)
-
-This is Epstein & Axtell's Sugarscape Constant Growback model, with a detailed description in the Chapter Two of *Growing Artificial Societies: Social Science from the Bottom Up*. It is based on the Netlogo
-[Sugarscape 2 Constant Growback](http://ccl.northwestern.edu/netlogo/models/Sugarscape2ConstantGrowback) model.
-
-### [Sugarscape Constant Growback Model with Traders](https://github.com/projectmesa/mesa-examples/tree/main/examples/sugarscape_g1mt)
-
-This is Epstein & Axtell's Sugarscape model with Traders, a detailed description is in Chapter four of *Growing Artificial Societies: Social Science from the Bottom Up (1996)*. The model shows an emergent price equilibrium can happen via a decentralized dynamics.
-
-### [Wolf-Sheep Predation Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/wolf_sheep)
-
-Implementation of an ecological model of predation and reproduction, based on the NetLogo [Wolf Sheep Predation](http://ccl.northwestern.edu/netlogo/models/WolfSheepPredation) model.
 
 ## Continuous Space Examples
+_No user examples available yet._
 
-### [Boids Flockers Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/boid_flockers)
-
-[Boids](https://en.wikipedia.org/wiki/Boids)-style flocking model, demonstrating the use of agents moving through a continuous space following direction vectors.
 
 ## Network Examples
 
 ### [Boltzmann Wealth Model with Network](https://github.com/projectmesa/mesa-examples/tree/main/examples/boltzmann_wealth_model_network)
 
 This is the same [Boltzmann Wealth](https://github.com/projectmesa/mesa-examples/tree/main/examples/boltzmann_wealth_model) Model, but with a network grid implementation.
 
-### [Virus on a Network Model](https://github.com/projectmesa/mesa-examples/tree/main/examples/virus_on_network)
-
-This model is based on the NetLogo [Virus on a Network](https://ccl.northwestern.edu/netlogo/models/VirusonaNetwork) model.
-
 ### [Ant System for Traveling Salesman Problem](https://github.com/projectmesa/mesa-examples/tree/main/examples/aco_tsp)
 
 This is based on Dorigo's Ant System "Swarm Intelligence" algorithm for generating solutions for the Traveling Salesman Problem.
 
 ## Visualization Examples
 
-### [Boltzmann Wealth Model)](https://github.com/projectmesa/mesa-examples/tree/main/examples/boltzmann_wealth_model)
-
-Boltzmann Wealth model with an optional visualization using Streamlit.
-
 ### [Charts Example](https://github.com/projectmesa/mesa-examples/tree/main/examples/charts)
 
 A modified version of the [Bank Reserves](https://github.com/projectmesa/mesa-examples/tree/main/examples/bank_reserves) example made to provide examples of Mesa's charting tools.