Make the fuchsia mojo/public repo the source of truth.

mojo/public/rust/README.md

Index: mojo/public/rust/README.md
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-# Mojo Rust Public Bindings
-
-This crate contains the public Mojo bindings for Rust.
-
-## Build Instructions within Mojo Source Tree
-
-In the Mojo source tree, this crate gets compiled directly with examples, so for
-instructions on how to use those examples, please see the //examples directory
-at the root of the repository.
-
-Additionally, the Rust tests run as part of the overarching test suite, invoked
-by running
-
-```bash
-mojo/tools/mojob.py test
-```
-
-from the root directory.
-
-## Standalone Build Instructions
-
-1.  Build Mojo Dependencies (from source root)
-
-```bash
-mojo/tools/mojob.py gn
-mojo/tools/mojob.py build
-```
-
-2.  Build with Cargo (from this directory)
-
-First, set the Mojo output directory in order for Cargo to be able to find the
-Mojo dependencies:
-
-```bash
-export MOJO_OUT_DIR=/path/to/out/Debug
-```
-
-Then build normally using Cargo:
-
-```bash
-cargo build [--release]
-```
-
-Additional non-standard environment variables that Cargo will respond to:
-*   MOJO_RUST_NO_EMBED - Specifies to not bundle the Mojo embedder or link
-    against libstdc++, however tests will not work.
-
-3.  Test
-
-Note: if you set MOJO_RUST_NO_EMBED, running tests will fail.
-
-```bash
-cargo test [--release]
-```
-