Remove the redundant detailed macOS installation guide

uv reduced installation to a single cross-platform command and
auto-downloads Python when needed, so the separate step-by-step macOS
guide no longer added platform-specific value over installation.rst. Its
legacy conda section also hardcoded the Intel-only Miniconda installer,
which is wrong on Apple Silicon.

Delete INSTALLATION.rst and its docs/macos_installation.rst include, drop
the sdist include entry, and unlink the page from the README, the
installation page tip, and the getting-started toctree.

Author: wmayner

INSTALLATION.rst

@@ -136,10 +136,6 @@ python -m pip install pyphi                     # current release (1.x)
 python -m pip install "git+https://github.com/wmayner/pyphi@main"   # 2.0 (IIT 4.0)
 ```
 
-### Detailed installation guide for macOS
-
-[See here](https://github.com/wmayner/pyphi/blob/main/INSTALLATION.rst).
-
 ## Contributing
 
 To help develop PyPhi, fork the project on GitHub, clone your fork, and install

README.md

@@ -4,6 +4,5 @@
 :maxdepth: 1
 
 ../installation
-../macos_installation
 first-computation
 ```

docs/getting-started/index.md

@@ -41,10 +41,6 @@ To install the latest development version:
 
     pip install "git+https://github.com/wmayner/pyphi@main#egg=pyphi"
 
-.. tip::
-    For detailed instructions on how to install PyPhi on macOS, see the
-    :ref:`macos-installation`.
-
 Legacy: Conda (Deprecated)
 ==========================
 

docs/installation.rst

@@ -104,7 +104,6 @@ fallback_version = "0.0.0"
 [tool.hatch.build.targets.sdist]
 include = [
     "README.md",
-    "INSTALLATION.rst",
     "CACHING.rst",
     "LICENSE.md",
     "CHANGELOG.md",