docs: structure documentations

[ramin-deriv]

Clickup link:
Fixes issue: #

This PR contains the following changes:

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

Developers Note (Optional)

Pre-launch Checklist (For PR creator)

As a creator of this PR:

• ✍️ I have included clickup id and package/app_name in the PR title.
• 👁️ I have gone through the code and removed any temporary changes (commented lines, prints, debug statements etc.).
• ⚒️ I have fixed any errors/warnings shown by the analyzer/linter.
• 📝 I have added documentation, comments and logging wherever required.
• 🧪 I have added necessary tests for these changes.
• 🔎 I have ensured all existing tests are passing.

Reviewers

Pre-launch Checklist (For Reviewers)

As a reviewer I ensure that:

• ✴️ This PR follows the standard PR template.
• 🪩 The information in this PR properly reflects the code changes.
• 🧪 All the necessary tests for this PR's are passing.

Pre-launch Checklist (For QA)

• 👌 It passes the acceptance criteria.

Pre-launch Checklist (For Maintainer)

• [MAINTAINER_NAME] I make sure this PR fulfills its purpose.

Summary by Sourcery

Restructure the project documentation into a comprehensive, multi-layered guide covering installation, basic usage, chart types, configuration, core concepts, features, and advanced usage.

Enhancements:

• Organize documentation into logical sections for easier navigation and discovery

Documentation:

• Add Getting Started guides (installation, basic usage, chart types, configuration)
• Add Core Concepts guides (architecture, data models, coordinate system, rendering pipeline)
• Add Features guides (annotations, markers, crosshair, technical indicators overview, drawing tools overview)
• Add Advanced Usage guides (real-time data updates, performance optimization, custom themes)
• Update README to reflect the new documentation structure and table of contents

[sourcery-ai]

Reviewer's Guide

This PR establishes a comprehensive, modular documentation site for the Deriv Chart library by adding a structured set of Markdown files organized into “Getting Started,” “Core Concepts,” “Features,” and “Advanced Usage” sections (plus a root README). Each file focuses on a specific topic—ranging from basic setup and chart types to the rendering pipeline, data models, real-time data handling, and theming—providing a clear, navigable documentation hierarchy.

File-Level Changes

Change	Details	Files
Add Getting Started guides	Basic usage overview Chart types reference Configuration options Installation instructions	doc/getting_started/basic_usage.md doc/getting_started/chart_types.md doc/getting_started/configuration.md doc/getting_started/installation.md
Introduce core concepts section	Describe overall architecture Explain coordinate system Detail data models Outline rendering pipeline	doc/core_concepts/architecture.md doc/core_concepts/coordinate_system.md doc/core_concepts/data_models.md doc/core_concepts/rendering_pipeline.md
Document library features	Annotations guide Markers guide Crosshair guide Technical indicators overview Drawing tools overview	doc/features/annotations.md doc/features/markers.md doc/features/crosshair.md doc/features/indicators/overview.md doc/features/drawing_tools/overview.md
Provide advanced usage tutorials	Real-time data handling Performance optimization techniques Custom theme creation	doc/advanced_usage/real_time_data.md doc/advanced_usage/performance_optimization.md doc/advanced_usage/custom_themes.md
Add root index and installation guide	Root README with site structure Installation and setup instructions	doc/README.md doc/getting_started/installation.md

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