feat: add theme toggle in mobile and tablet view

[thecuriousash]

Description

Added a theme toggle in mobile and tablet view.
Fixes #216

⚠️ Note: The theme toggle will align perfectly when #283 is merged.

Changes Made

Global Stylesheet (public/css/home.css):

• Kept .navbar-links container visible on screens $\le 768px$ but hid text links and dropdown elements inside it.
• Hid the .navbar-actions container to prevent JavaScript inline style overrides.
• Hid the logo subtext (.logo-subtext) on small screens ($\le 375px$) to free up horizontal space and prevent layout wrapping.

Home Page (public/home.html):

• Added target class logo-subtext and prevented wrapping on the logo subtext using white-space: nowrap;.

Team Page (public/team.html):

• Kept the container .team-nav-links visible and right-aligned, and hid only the text links, keeping the toggle button visible.

Screenshots (if applicable)

Checklist

• I have linked the relevant issue above.
• I have tested my changes locally.
• My code follows the project's style guidelines.

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