Implement documentation setup and Docker configuration for LWC project

doc/lwc-doc/Dockerfile

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+FROM squidfunk/mkdocs-material
+RUN apk add --no-cache \
+    cairo \
+    pango \
+    gdk-pixbuf \
+    libffi \
+    fontconfig \
+    ttf-dejavu \
+    gcc \
+    g++ \
+    musl-dev \
+    python3-dev \
+    && pip install mkdocs-with-pdf \
+    && apk del --no-cache gcc g++ musl-dev python3-dev

doc/lwc-doc/docs/assets/pdf_button.js

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+document.addEventListener("DOMContentLoaded", function () {
+  const btn = document.createElement("a");
+  btn.href = "/pdf/document.pdf";
+  btn.download = "lwc-documentation.pdf";
+  btn.title = "Скачать всю документацию в PDF";
+  btn.style.cssText = [
+    "position: fixed",
+    "bottom: 24px",
+    "right: 24px",
+    "z-index: 9999",
+    "background: var(--md-primary-fg-color, #1976d2)",
+    "color: #fff",
+    "padding: 12px 18px",
+    "border-radius: 24px",
+    "text-decoration: none",
+    "font-weight: 600",
+    "font-size: 14px",
+    "box-shadow: 0 3px 10px rgba(0,0,0,0.25)",
+    "display: flex",
+    "align-items: center",
+    "gap: 8px",
+    "transition: opacity .2s",
+  ].join(";");
+  btn.innerHTML = "📄 Скачать PDF";
+  btn.onmouseenter = () => (btn.style.opacity = "0.85");
+  btn.onmouseleave = () => (btn.style.opacity = "1");
+  document.body.appendChild(btn);
+});

doc/lwc-doc/docs/index.md

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+# Welcome to MkDocs выq
+
+For full documentation visit [mkdocs.org](https://www.mkdocs.org).
+
+## Commands
+
+* `mkdocs new [dir-name]` - Create a new project.
+* `mkdocs serve` - Start the live-reloading docs server.
+* `mkdocs build` - Build the documentation site.
+* `mkdocs -h` - Print help message and exit.
+
+## Project layout
+
+    mkdocs.yml    # The configuration file.
+    docs/
+        index.md  # The documentation homepage.
+        ...       # Other markdown pages, images and other files.

doc/lwc-doc/mkdocs.yml

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+site_name: Документация LWC
+site_description: Документация по использованию коллаборативного робота KUKA LBR iiwa 7 и его программированию в среде ROS 2.
+site_author: Даниил Грабарь
+
+theme:
+  name: material
+  language: ru
+  features:
+    - navigation.tabs
+    - navigation.tabs.sticky
+    - navigation.sections
+    - navigation.expand
+    - navigation.top
+    - search.highlight
+
+plugins:
+  - search
+  - with-pdf:
+      author: Даниил Грабарь
+      cover_title: Документация LWC
+      cover_subtitle: KUKA LBR iiwa7 ROS2 Control Framework
+      output_path: pdf/document.pdf
+
+extra_javascript:
+  - assets/pdf_button.js
+
+markdown_extensions:
+  - admonition
+  - pymdownx.highlight
+  - pymdownx.superfences
+
+nav:
+  - Главная: index.md
+
+  # - Обзор проекта:
+  #   - Введение: overview/intro.md
+  #   - Архитектура: overview/architecture.md
+  #   - Зависимости: overview/dependencies.md
+
+  # - Установка:
+  #   - Требования: install/requirements.md
+  #   - ROS2: install/ros2.md
+  #   - KUKA FRI: install/fri.md
+
+  # - Разработка:
+  #   - Структура пакетов: dev/packages.md
+  #   - Камеры RealSense: dev/realsense.md
+  #   - Управление KUKA: dev/kuka.md
+  #   - Сборка: dev/build.md
+
+  # - API:
+  #   - Обзор: api/overview.md
+  #   - Топики: api/topics.md
+  #   - Сервисы: api/services.md