chore: bump version to 0.21.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: maloun96

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "aidocs"
-version = "0.20.0"
+version = "0.21.0"
 description = "AI-powered documentation generator for web applications. Install docs commands into your Claude Code project."
 readme = "README.md"
 license = { text = "MIT" }