NLR updates and improve formatting

[kdayday]

• Replace some lingering NREL URLs and references on the homepage
• Replace old image
• Tighten up homepage formatting and improve header and footer consistency
  View: https://sienna-platform.github.io/Sienna/pr-preview/pr-76/

[Copilot]

Pull request overview

Updates the Sienna website content and styling to reflect “NLR” branding, refresh homepage visuals, and tighten header/footer layout consistency.

Changes:

• Replaced NREL references/URLs/emails with NLR equivalents across homepage, nav, resources, and footer.
• Updated homepage hero/service copy and swapped the “about” image asset.
• Adjusted site CSS for header/footer spacing, typography, and testimonial color styling.

Reviewed changes

Copilot reviewed 10 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pages/resources.md	Updates “Work with Us” contact email to the new domain.
pages/publications.md	Updates PR100 publication venue/URL to NLR branding.
assets/img/nlr.png	Adds new “about” section image used on the homepage.
assets/css/main.min.css	Tweaks header/footer/banner spacing + typography; adds testimonial styling.
_layouts/home-sienna.html	Updates homepage email link, copy, and “about NLR” section + image/URL.
_includes/footer/footer-sienna.html	Updates footer branding, layout columns, and contact details.
_data/testimonials/testimonials-sienna.yml	Updates testimonial company strings from NREL → NLR.
_data/settings.yml	Updates canonical contact email/mailto values.
_data/navigation-menu/sidemenu.yml	Updates ABOUT US external link to nlr.gov.
_data/navigation-menu/secondary.yml	Updates ABOUT US external link to nlr.gov.
README.md	Adds local dev note about jekyll clean and cache/CSS visibility.

Comments suppressed due to low confidence (2)

_includes/footer/footer-sienna.html:21

• The footer hard-codes a phone number that doesn't match the canonical contact info in _data/settings.yml (contact_settings.phone_number). To avoid inconsistent contact details across the site, either update the settings value to match or render the footer phone number from the settings data.

            <li>
              <span class="wz-icon"><i class="lni lni-phone"></i></span>
              <p>(+1) 303-275-3921</p>
            </li>

assets/css/main.min.css:19077

• The selector .nav-toggle-btn.white.black-on-mobile .stick now sets the stick color to white, which conflicts with the intent implied by the black-on-mobile class name and also diverges from the toggle title color (still forced to black below). This is likely to cause visibility/contrast issues on mobile; either revert the stick color to black for this variant or rename/adjust the class + related styles so behavior matches the naming and the title/sticks are consistent.

    .nav-toggle-btn.white.black-on-mobile .stick {
        background-color: #fff !important;
    }

    .nav-toggle-btn.white.black-on-mobile .nav-toggle-title {
        color: #000 !important;

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