revert: point to the subdomain instead (#37155)

This reverts commit 3fa6c6a032.

client/src/components/Footer/__snapshots__/Footer.test.js.snap

@@ -23,9 +23,7 @@ exports[`<Footer /> matches snapshot 1`] = `
           Donations to freeCodeCamp go toward our education initiatives, and help pay for servers, services, and staff. You can 
           <a
             className="inline"
-            href="https://donate.freecodecamp.org"
-            rel="noopener noreferrer"
-            target="_blank"
+            href="/donate"
           >
             make a tax-deductible donation here
           </a>
@@ -48,9 +46,7 @@ exports[`<Footer /> matches snapshot 1`] = `
           About
         </a>
         <a
-          href="https://donate.freecodecamp.org"
-          rel="noopener noreferrer"
-          target="_blank"
+          href="/donate"
         >
           Donate
         </a>

client/src/components/Footer/footerLinks.json

@@ -4,7 +4,7 @@
       "title": "Our Nonprofit",
       "links": [
         { "to": "/news/about/", "text": "About" },
-        { "to": "https://donate.freecodecamp.org", "text": "Donate" },
+        { "to": "/donate", "text": "Donate", "internal": true },
         { "to": "/news/shop/", "text": "Shop" },
         {
           "to": "https://www.linkedin.com/school/free-code-camp/people/",

client/src/components/Footer/index.js

@@ -38,11 +38,7 @@ function Footer() {
             <p>
               Donations to freeCodeCamp go toward our education initiatives, and
               help pay for servers, services, and staff. You can&nbsp;
-              <Link
-                className='inline'
-                external={true}
-                to='https://donate.freecodecamp.org'
-              >
+              <Link className='inline' to='/donate'>
                 make a tax-deductible donation here
               </Link>
               .