Move some documents to relevant sections (#5968)

docs/reference/platforms.md

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+# Platform support
+
+uv has Tier 1 support for the following platforms:
+
+- macOS (Apple Silicon)
+- macOS (x86_64)
+- Linux (x86_64)
+- Windows (x86_64)
+
+uv is continuously built, tested, and developed against its Tier 1 platforms. Inspired by the Rust
+project, Tier 1 can be thought of as
+["guaranteed to work"](https://doc.rust-lang.org/beta/rustc/platform-support.html).
+
+uv has Tier 2 support
+(["guaranteed to build"](https://doc.rust-lang.org/beta/rustc/platform-support.html)) for the
+following platforms:
+
+- Linux (PPC64)
+- Linux (PPC64LE)
+- Linux (aarch64)
+- Linux (armv7)
+- Linux (i686)
+- Linux (s390x)
+
+uv ships pre-built wheels to [PyPI](https://pypi.org/project/uv/) for its Tier 1 and Tier 2
+platforms. However, while Tier 2 platforms are continuously built, they are not continuously tested
+or developed against, and so stability may vary in practice.
+
+Beyond the Tier 1 and Tier 2 platforms, uv is known to build on i686 Windows, and known _not_ to
+build on aarch64 Windows, but does not consider either platform to be supported at this time. The
+minimum supported Windows version is Windows 10, following
+[Rust's own Tier 1 support](https://blog.rust-lang.org/2024/02/26/Windows-7.html).
+
+uv supports and is tested against Python 3.8, 3.9, 3.10, 3.11, and 3.12.

docs/reference/versioning.md

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+# Versioning
+
+uv uses a custom versioning scheme in which the minor version number is bumped for breaking changes,
+and the patch version number is bumped for bug fixes, enhancements, and other non-breaking changes.
+
+uv does not yet have a stable API; once uv's API is stable (v1.0.0), the versioning scheme will
+adhere to [Semantic Versioning](https://semver.org/).
+
+uv's changelog can be [viewed on GitHub](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md).