Hide Projects tab from navigation

[Copilot]

The Projects navigation tab has been removed from the site header to simplify the main navigation.

Changes

• Navigation: Commented out the Projects tab in _includes/header.html (lines 39-47)
• Content preservation: Projects page files (projects.md, _includes/projects-home.html) remain in the repository but are not linked from navigation

The implementation uses HTML comments to hide the entire Liquid conditional block:

<!-- {% if current[1] == "projects" %}
<li class="nav-item active">
    <a class="nav-link active" href="{{ site.baseurl }}/projects">Projects</a>
</li>
{% else %}
    <li class="nav-item">
        <a class="nav-link" href="{{ site.baseurl }}/projects">Projects</a>
    </li>
{% endif %} -->

This prevents the Projects link from rendering in the navbar while preserving the underlying content for potential future use.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Hide projects tab on master branch</issue_title>
<issue_description></issue_description>

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

• Fixes Hide projects tab on master branch #72

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