feat(docs): set up Docusaurus in ./docs directory

[evgheni7]

Overview

Set up Docusaurus in the ./docs directory to publish the existing Markdown documentation as a proper documentation website.

Current State

The ./docs directory already contains the following Markdown files:

Root:

• overview.md
• commands.md
• configuration.md
• development.md
• examples.md
• troubleshoot.md

guide/:

• getting-started.md
• environments.md
• configurations.md
• providers.md
• functions.md
• registries.md
• resources.md
• local-nodes.md
• remote-nodes.md
• plugins.md

registry/:

• auth.md

Tasks

• Initialise Docusaurus inside ./docs (using the classic preset)
• Map existing .md files into the Docusaurus sidebar structure (preserve current directory layout)
• Configure docusaurus.config.js with project name, URL, and branding (use existing logo assets already in ./docs)
• Add a CI job (GitHub Actions) to build and deploy the site (e.g. GitHub Pages)
• Ensure ./docs is self-contained — do not move source .md files out of their current locations