Fix mobile menu parent link navigation

[bernardhanna]

Summary

• Restore real href links for Blog, Community, and Resources top-level menu items instead of desktop-only onclick handlers.
• Update mobile menu click handling so tapping the label navigates to the parent page, while tapping the chevron expands the submenu.
• Add mobile-only submenu entries for Blog, Community, and Resources so users can still reach the parent page after expanding a section.

Test plan

• Open the site on a viewport below 1280px and open the mobile menu.
• Tap Blog, Community, and Resources labels and confirm each navigates to the correct page.
• Tap the chevron beside each of those items and confirm the submenu opens without navigating away.
• Confirm submenu items such as Share your stories and Grassroots Grants still work.
• Confirm desktop menu hover/click behavior is unchanged.

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