Add Docusaurus Handbook skeleton

[denniskuijs]

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[Copilot]

Pull request overview

This PR creates a new Docusaurus-based handbook skeleton for OpenRemote, setting up the foundation for documentation hosted at https://handbook.openremote.io/. The PR includes all necessary configuration files, styling, assets, and CI/CD pipeline for automatic deployment to GitHub Pages.

Changes:

• Added Docusaurus 3.9.2 with TypeScript support and necessary configuration files
• Set up GitHub Actions CI/CD workflow for automated build and deployment
• Added initial documentation structure with a basic introduction page
• Configured custom CSS styling, branding assets (logos, favicon), and search integration (Algolia)

Reviewed changes

Copilot reviewed 10 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
package.json	Defines project dependencies, scripts, and Docusaurus 3.9.2 setup
docusaurus.config.ts	Configures site metadata, navigation, footer, theme, and integrations (GTM, Algolia)
tsconfig.json	TypeScript configuration extending Docusaurus defaults
sidebars.ts	Defines documentation sidebar structure with introduction page
src/pages/index.tsx	Home page that redirects to introduction documentation
src/css/styles.css	Custom CSS with theme variables and DocSearch styling
static/img/*	Branding assets including logo, favicon, and social card
static/.nojekyll	Prevents GitHub Pages from using Jekyll processing
.github/workflows/ci_cd.yml	CI/CD pipeline for building and deploying to GitHub Pages
.gitignore	Standard ignore patterns for Docusaurus, Node.js, and IDEs
.yarnrc.yml	Yarn v4 configuration
CNAME	Custom domain configuration for GitHub Pages
README.md	Project documentation with setup and deployment instructions
docs/introduction.md	Initial documentation page skeleton

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