GRM-141: feat: consolidate docs checks into devx-docs-check target

.vale/styles/devx/CodeBlockLanguage.yml

@@ -3,4 +3,4 @@ message: "Unlabeled code block — add a language tag (```bash, ```yaml, etc.)"
 level: warning
 scope: raw
 raw:
-  - '(?s)```\n(?!.*```)'
+  - '(?ms)^\n```\n.*?^```\s*$'

.vale/styles/write-good/README.md

@@ -2,7 +2,7 @@ Based on [write-good](https://github.com/btford/write-good).
 
 > Naive linter for English prose for developers who can't write good and wanna learn to do other stuff good too.
 
-```text
+```
 The MIT License (MIT)
 
 Copyright (c) 2014 Brian Ford