docs: bring the document set into the standard shape

Assisted-by: GLM 5.3 Flash

README.md

@@ -72,7 +72,7 @@ has no runtime dependency on the toolchain.
 Prebuilt binaries for linux/amd64, linux/arm64, linux/riscv64 and
 linux/loong64 are on the
 [releases page](https://sourcedock.dev/petrbalvin/gasm-devkit/releases).
-From source (Go 1.27 or later):
+From source (Go 1.27.1):
 
 ```sh
 go install sourcedock.dev/petrbalvin/gasm-devkit/cmd/gasm@latest
@@ -161,7 +161,6 @@ recipe.
 - [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md): components and data flow
 - [docs/CLI.md](docs/CLI.md): full command reference
 - [docs/DEVELOPMENT.md](docs/DEVELOPMENT.md): development setup and recipes
-- [docs/DECISIONS.md](docs/DECISIONS.md): deferred design decisions
 - [CHANGELOG.md](CHANGELOG.md): release history
 
 ## Licence