Readme updates (#345)

README.md

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             <img src="https://raw.githubusercontent.com/SunnySuite/Sunny.jl/main/assets/sunny_logo.svg" alt="Sunny.jl" width="350px">
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-            <b>Documentation:</b>&nbsp;&nbsp;
-            <a href="https://sunnysuite.github.io/Sunny.jl/stable"><img src="https://img.shields.io/badge/docs-stable-blue.svg" alt="Docs-stable"></a>&nbsp;&nbsp;
-            <a href="https://sunnysuite.github.io/Sunny.jl/dev"><img src="https://img.shields.io/badge/docs-dev-blue.svg" alt="Docs-dev"></a>
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-            <b>Build status:</b>&nbsp;&nbsp;
-            <a href="https://github.com/SunnySuite/Sunny.jl/actions/workflows/CI.yml?query=branch%3Amain"><img src="https://github.com/SunnySuite/Sunny.jl/actions/workflows/CI.yml/badge.svg?branch=main" alt="CI"></a>
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+    <a href="https://sunnysuite.github.io/Sunny.jl/stable"><img src="https://img.shields.io/badge/docs-stable-blue.svg" alt="Docs-stable"></a>
+    <a href="https://github.com/SunnySuite/Sunny.jl/actions/workflows/CI.yml?query=branch%3Amain"><img src="https://github.com/SunnySuite/Sunny.jl/actions/workflows/CI.yml/badge.svg?branch=main" alt="CI"></a>
 </div>
 
 ## Overview
 
-Sunny is a Julia package for modeling atomic-scale magnetism. Through spin dynamics simulations, it enables direct comparison with experimental scattering data, e.g., neutrons or x-rays. Ease of use is a priority, with tools for symmetry-guided modeling and interactive visualization.
+Sunny is a Julia package for modeling atomic-scale magnetism with quantum effects. Spin dynamics simulation enables direct comparison with experimental scattering data, e.g., neutrons or x-rays. Ease of use is a priority, with tools for symmetry-guided modeling and interactive visualization.
 
-At low-temperatures, Sunny supports the usual linear spin wave theory of spin dipoles, and its [multi-flavor generalization](https://arxiv.org/abs/1307.7731). At finite temperatures, Sunny can calculate the dynamical structure factor using classical spin dynamics with [quantum corrections](https://arxiv.org/abs/2310.19905). Langevin coupling to a thermal bath makes possible the study of non-equilibrium dynamics, e.g., thermal transport, pump-probe experiments, and spin-glass relaxation. Sunny also provides powerful Monte Carlo algorithms for collecting statistics in thermal equilibrium.
-
-A unique feature of Sunny is its treatment of spins as [SU(_N_) coherent states](https://arxiv.org/abs/2106.14125). This theory generalizes Landau-Lifshitz spin dynamics to a [nonlinear Schrödinger equation](https://arxiv.org/abs/2204.07563), which retains $N=2s+1$ levels for each quantum spin-_s_ state. The generalization is important for models with strong single-ion anisotropy (see the **[FeI₂ tutorial](https://sunnysuite.github.io/Sunny.jl/stable/examples/03_LSWT_SU3_FeI2.html)**) and for [localized "units" of strongly entangled spins](https://arxiv.org/abs/2405.16315).  Efficient simulation is enabled by [several algorithmic advances](https://github.com/SunnySuite/Sunny.jl/wiki/Sunny-literature).
+At low-temperatures, Sunny supports the usual linear spin wave theory of spin dipoles with generalization to multi-flavor bosons. At finite temperatures, Sunny supports the classical Landau-Lifshitz spin dynamics with generalization to SU(_N_) coherent states. Such generalizations are useful for modeling the coupled dynamics of higher order spin multipoles (see, e.g., the [FeI₂ tutorial](https://sunnysuite.github.io/Sunny.jl/stable/examples/03_LSWT_SU3_FeI2.html)), and for capturing localized "units" of strongly entangled spins. Dynamical coupling to a thermal bath makes possible the study of non-equilibrium dynamics, e.g., thermal transport, pump-probe experiments, and spin-glass relaxation. Many of these features build on our team's [theoretical research](https://sunnysuite.github.io/Sunny.jl/stable/why.html#Advanced-theory-made-accessible).
 
 ## Try it out!
 
-[Install Sunny](https://github.com/SunnySuite/Sunny.jl/wiki/Getting-started-with-Julia) and try the **[Tutorials](https://sunnysuite.github.io/Sunny.jl/stable/examples/01_LSWT_CoRh2O4)**. For traditional linear spin wave theory, see also the **[SpinW ports](https://sunnysuite.github.io/Sunny.jl/stable/examples/spinw/SW01_FM_Heseinberg_chain.html)**.
+Start by browsing the **[Tutorials](https://sunnysuite.github.io/Sunny.jl/stable/examples/01_LSWT_CoRh2O4)**. For traditional linear spin wave theory, see also the [SpinW ports](https://sunnysuite.github.io/Sunny.jl/stable/examples/spinw/SW01_FM_Heseinberg_chain.html).
 
-See [Version History](https://sunnysuite.github.io/Sunny.jl/dev/versions) for new features and breaking changes. To install a specific version of Sunny, say `v0.x`, use the command `add [email protected]`.
+See [Getting Started](https://github.com/SunnySuite/Sunny.jl/wiki/Getting-started-with-Julia) for installation instructions. [Version History](https://sunnysuite.github.io/Sunny.jl/dev/versions) lists new features and breaking changes.
 
-## Other spin wave codes
+## Related packages
 
-Sunny is inspired by SpinW, especially regarding symmetry analysis and traditional spin wave theory. Relative to other spin wave codes, this table highlights Sunny's special features (as of 2024):
+Sunny is inspired by SpinW, especially regarding symmetry analysis and traditional spin wave theory. Relative to other spin wave codes, this table highlights Sunny's special features (as of 2025):
 
 | | [McPhase](https://github.com/mducle/mcphase) | [SpinW](https://github.com/SpinW/spinw) | Sunny |
 | -- | -- | -- | -- |