docs: fundamentals section

[hejsztynx]

Summary

First section of the docs - Fundamentals

Added a react-native-web plugin, to allow interactive examples

Configured ESLint, so it checks the files in the docs - we want to keep the code of interactive examples clean

[Copilot]

Pull request overview

Adds the initial “Fundamentals” documentation section for React Native Enriched HTML and introduces an interactive, in-browser example system for the docs site by wiring React Native components to react-native-web.

Changes:

• Added new Fundamentals pages (Getting started, Core concepts, HTML tags reference, and “Your first editor” walkthrough).
• Introduced an InteractiveExample component (preview/code tabs + reset) and a first runnable example (FirstEditor.tsx).
• Updated the docs build to support interactive RN examples via a react-native-web webpack alias, plus added required dependencies/loaders.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/yarn.lock	Updates lockfile for new docs dependencies (react-native(-web), raw-loader, etc.).
docs/src/theme/MDXComponents.js	Registers InteractiveExample as an available MDX component.
docs/src/examples/FirstEditor.tsx	Adds the first runnable interactive example used in Fundamentals docs.
docs/src/components/InteractiveExample/styles.module.css	Styles for the interactive example container, tabs, and preview/code layout.
docs/src/components/InteractiveExample/index.tsx	Implements interactive example preview/code tabs with a reset mechanism.
docs/package.json	Adds dependencies needed to render RN examples in the docs site and raw source loading.
docs/docusaurus.config.js	Adds a small plugin to alias react-native to react-native-web for the docs webpack build.
docs/docs/fundamentals/your-first-editor.mdx	New “Your first editor” page including a live interactive example embed.
docs/docs/fundamentals/your-first-editor.md	Removes the old placeholder page in favor of the new MDX version.
docs/docs/fundamentals/html-format-and-supported-tags.md	Fills in the supported-tags reference content and conflict/blocking rules.
docs/docs/fundamentals/getting-started.md	Replaces placeholder with Getting Started content (installation, prerequisites, etc.).
docs/docs/fundamentals/core-concepts.md	Replaces placeholder with Core Concepts content (uncontrolled model, HTML source of truth, etc.).

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[exploIF]

Looks very promising, great job