Prepare cairo-lang-macro-stable for publishing (#1491)

commit-id:d6079208

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**Stack**:
- #1497
- #1496
- #1495
- #1494
- #1493
- #1492
- #1491 ⬅


⚠️ *Part of a stack created by [spr](https://github.com/ejoffe/spr). Do
not merge manually using the UI - doing so may have unexpected results.*

plugins/cairo-lang-macro-stable/README.md

@@ -1,3 +1,4 @@
-# cairo-lang-macro-stable
+# Cairo Lang Macro Stable
 
 Stable interface for Scarb procedural macros.
+Please see the [`cairo-lang-macro`](https://crates.io/crates/cairo-lang-macro) crate for more information.