Implement modern SEO best practices

[Copilot]

Website had nofollow robots meta tag blocking search engines from following links. Missing modern SEO requirements: Open Graph tags, structured data, and outdated HTTP references.

Changes

Critical fixes:

• Removed <meta name="robots" content="nofollow" /> blocking search engine crawling
• Fixed typo in keywords: "controle de verão" → "controle de versão"

Social media optimization:

• Added Open Graph meta tags (og:type, og:url, og:title, og:description, og:image, og:locale)
• Added Twitter Card meta tags (summary_large_image format)

Structured data:

• Added JSON-LD Schema.org markup (WebSite type with author/publisher info)

Technical updates:

• Updated sitemap.xml: HTTP→HTTPS, lastmod 2014→2025, added priority
• Updated robots.txt: HTTP→HTTPS
• Added theme-color meta tag for mobile browsers

Example

<!-- Open Graph / Facebook -->
<meta property="og:type" content="website">
<meta property="og:url" content="https://comandosgit.github.io/">
<meta property="og:title" content="Comandos Git - Aprenda Git do básico ao avançado">
<meta property="og:image" content="https://comandosgit.github.io/img/comandos-git.png">
<meta property="og:locale" content="pt_BR">

<!-- JSON-LD Structured Data -->
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "WebSite",
  "name": "Comandos Git",
  "url": "https://comandosgit.github.io/",
  "inLanguage": "pt-BR"
}
</script>

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Improve SEO</issue_title>
<issue_description># Goal

The goal is to improve SEO with small changes in order to put in place the lasted best practices launched since the website was created 11 years ago.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Improve SEO #30

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