Implement documentation setup and Docker configuration for LWC project

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.