Point at the GitHub mirror and document that it is read-only

`Cargo.toml` named github.com/bryant/invoiceninjars, a guess from the
git author name that was never a real repository. It now points at the
mirror that actually exists, so the crates.io "Repository" link will
resolve.

Gitea is the source of truth and a push mirror copies every commit to
GitHub. Anything written to the GitHub copy is overwritten by the next
sync, so a merged pull request there would silently vanish. README and
GOALS.md say so, and direct issues and pull requests to Gitea.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Cargo.toml

@@ -9,7 +9,7 @@ edition = "2021"
 rust-version = "1.88"
 description = "An async Rust client for the Invoice Ninja v5 API"
 license = "MIT"
-repository = "https://github.com/bryant/invoiceninjars"
+repository = "https://github.com/awkawb1/invoiceninja-sdk"
 
 [dependencies]
 reqwest = { version = "0.12", default-features = false, features = ["json", "native-tls"] }

GOALS.md

@@ -120,6 +120,13 @@ before 1.0**. Pin an exact version; expect breaking changes in minor
 releases. `CHANGELOG.md` records them, and breaking changes should be
 legible there rather than discovered at compile time.
 
+**Gitea is the source of truth; GitHub is a one-way mirror.** The canonical
+repository is `gitea.awkawb.cloud/awkawb/invoiceninja`. A Gitea push mirror
+copies every commit to <https://github.com/awkawb1/invoiceninja-sdk>, which
+is what `Cargo.toml` points at. Nothing should be written to the GitHub
+copy: the next sync overwrites it, so a merged pull request there would
+simply disappear. Contributions go through Gitea.
+
 `Error` is `#[non_exhaustive]` so that adding variants is not itself a
 breaking change.
 

README.md

@@ -8,6 +8,12 @@ Requires Rust 1.88 or newer.
 > breaking changes in minor releases; `CHANGELOG.md` records them.
 > [`GOALS.md`](GOALS.md) covers what the crate is for and what it is not.
 
+> **Development happens on
+> [Gitea](https://gitea.awkawb.cloud/awkawb/invoiceninja); the
+> [GitHub copy](https://github.com/awkawb1/invoiceninja-sdk) is a read-only
+> mirror.** Anything pushed to GitHub is overwritten by the next sync, so
+> please open issues and pull requests on Gitea.
+
 ## Development
 
 Enter the dev shell (Rust toolchain via `rust-overlay`):