docs: documentation readme and contribution guide update (#10023)

* draft readme and contrib-guide upd

* info on versioning

* python scripts remove explainer

* additional updates

* vale instructions upd

* table of contents

* language

* cleanup redundancies

* Update package.json

* section on llms.txt support

* improvements from pr review

Author: dfokina

CONTRIBUTING.md

@@ -25,6 +25,7 @@ and smooth out the experience for all involved. The community looks forward to y
   - [Suggesting Enhancements](#suggesting-enhancements)
     - [Before Submitting an Enhancement](#before-submitting-an-enhancement)
     - [How Do I Submit a Good Enhancement Suggestion?](#how-do-i-submit-a-good-enhancement-suggestion)
+  - [Contributing to Documentation](#contributing-to-documentation)
   - [Contribute code](#contribute-code)
     - [Where to start](#where-to-start)
     - [Setting up your development environment](#setting-up-your-development-environment)
@@ -129,6 +130,10 @@ Enhancement suggestions are tracked as GitHub issues of type [Feature request fo
 - Use a **clear and descriptive title** for the issue to identify the suggestion.
 - Fill the issue following the template
 
+## Contributing to Documentation
+
+If you'd like to improve the documentation by fixing errors, clarifying explanations, adding examples, or creating new guides, see the [Documentation Contributing Guide](docs-website/CONTRIBUTING.md).
+
 ## Contribute code
 
 > [!IMPORTANT]