Add Pyodide/WASM installation links to README and docs landing page

Addresses lucianopaz's feedback: make WASM installation instructions
discoverable from the README and docs index, not just install.rst.

Author: ericmjl

README.rst

@@ -115,6 +115,9 @@ The current development branch of |Project Name| can be installed from GitHub, a
     pip install git+https://github.com/pymc-devs/pytensor
 
 
+For browser-based Python environments (Pyodide/JupyterLite), see the `Pyodide installation instructions <https://pytensor.readthedocs.io/en/latest/install.html>`__.
+
+
 Background
 ==========
 

doc/index.rst

@@ -41,6 +41,8 @@ directory, so that when you pull updates via Git, they will be
 automatically reflected the "installed" version. For more information about
 installation and configuration, see :ref:`installing PyTensor <install>`.
 
+For browser-based Python environments (Pyodide/JupyterLite), see :ref:`the Pyodide installation section <install-pyodide>`.
+
 .. _available on PyPI: http://pypi.python.org/pypi/pytensor
 .. _Related Projects: https://github.com/pymc-devs/pytensor/wiki/Related-projects
 

doc/install.rst

@@ -31,6 +31,8 @@ To use the Numba and JAX backend you will need to install these libraries in add
 Installing on Pyodide (WebAssembly)
 -----------------------------------
 
+.. _install-pyodide:
+
 PyTensor can be used in browser-based Python environments via `Pyodide <https://pyodide.org/>`__, such as `JupyterLite <https://jupyterlite.readthedocs.io/>`__.
 
 PyPI does not yet accept WebAssembly wheels, so you'll need to install from a GitHub Release: