fix(llms): rename "Contribution Guide" to "Get Involved" for clarity

fix(sitemap): update lastmod date for PDF resource
fix(page): update link from "/contribute" to "/get-involved" for consistency

Author: mariomarcolongo

public/llms.txt

@@ -9,7 +9,7 @@ This project is open source. The content is licensed under CC BY-SA 4.0 and the
 - [Stats](https://yourselftoscience.org/stats): Statistics about the resources listed.
 - [Clinical Trials](https://yourselftoscience.org/clinical-trials): A dedicated page for clinical trial resources.
 - [Organ, Body & Tissue Donation](https://yourselftoscience.org/organ-body-tissue-donation): A dedicated page for organ, body, and tissue donation resources.
-- [Contribution Guide](https://yourselftoscience.org/contribute): Information on how to contribute to the project.
+- [Get Involved](https://yourselftoscience.org/get-involved): Information on how to contribute to the project.
 
 ## Markdown Versions
 - [Homepage (Markdown)](https://yourselftoscience.org/index.html.md)

public/sitemap.xml

@@ -56,7 +56,7 @@
   </url>
   <url>
     <loc>https://yourselftoscience.org/yourselftoscience.pdf</loc>
-    <lastmod>2025-11-11</lastmod>
+    <lastmod>2025-11-12</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.7</priority>
   </url>

public/yourselftoscience.pdf

@@ -732,7 +732,7 @@ function HomePageContent({ scrollY }) {
           </div>
           <div className="mt-4 flex flex-col gap-2">
             <Link
-              href="/contribute"
+              href="/get-involved"
               className="w-full flex items-center justify-center gap-2 px-4 py-2 text-sm font-medium text-white bg-apple-accent rounded-lg hover:bg-opacity-90 focus:ring-4 focus:outline-none focus:ring-blue-300 transition-colors"
             >
               <FaPlus />
@@ -865,7 +865,7 @@ function HomePageContent({ scrollY }) {
           {/* Mobile Buttons */}
           <div className="mt-8 flex flex-col items-center gap-2 w-full max-w-xs mx-auto lg:hidden">
              <Link
-                href="/contribute"
+                href="/get-involved"
                 className="w-full flex items-center justify-center gap-2 px-4 py-2 rounded bg-apple-accent text-white text-sm font-medium hover:opacity-90 transition-opacity"
               >
                 <FaPlus />