Enable robots.txt generation in Hugo config

[Copilot]

Hugo was not generating robots.txt, preventing proper search engine crawling configuration.

Changes

• Added enableRobotsTXT = true to config/_default/config.toml

This enables Hugo's built-in robots.txt generation, which outputs a default robots.txt with User-agent: * and Allow: / when the site is built.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>robot.txt not generated</issue_title>
<issue_description>potentially needs to be explicitly activated in config with enableRobotsTXT: true
</issue_description>

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

• Fixes robot.txt not generated #586

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