feat(gh-pages): add sitemap

pages/views/_data/site.json

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+{
+  "url": "https://exadel-inc.github.io/ui-playground"
+}

pages/views/robots.njk

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+---
+permalink: "/robots.txt"
+eleventyExcludeFromCollections: true
+---
+User-agent: *
+Sitemap: {{ site.url }}/sitemap.xml

pages/views/sitemap.njk

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+---
+permalink: "/sitemap.xml"
+eleventyExcludeFromCollections: true
+---
+
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  {% for page in collections.all %}
+    <url>
+      <loc>{{ site.url }}{{ page.url.replace(r/\/$/, ".html") if page.data.tags else page.url }}</loc>
+      <lastmod>{{ page.date.toISOString() }}</lastmod>
+      {%- if page.url == "/" %}
+      <changefreq>weekly</changefreq>
+      <priority>1.0</priority>
+      {%- endif %}
+    </url>
+  {% endfor %}
+</urlset>