Normalize social link aria-labels in TeamMember to include member name

GitHub and personal site links used generic labels ("GitHub Profile",
"Personal Site") that are indistinguishable across dozens of team members
for screen reader users. Include the member's name like the Twitter/
Threads/Bluesky links already do, and mark the decorative icons
aria-hidden so they don't pollute the accessible names.

Fixes #8552

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: deepusnath

src/components/MDX/TeamMember.tsx

@@ -113,7 +113,7 @@ export function TeamMember({
                   aria-label={`${name} on Twitter`}
                   href={`https://twitter.com/${twitter}`}
                   className="hover:text-primary hover:underline dark:text-primary-dark flex flex-row items-center">
-                  <IconTwitter className="pe-1" />
+                  <IconTwitter className="pe-1" aria-hidden="true" />
                   {twitter}
                 </ExternalLink>
               </div>
@@ -124,7 +124,7 @@ export function TeamMember({
                   aria-label={`${name} on Threads`}
                   href={`https://threads.net/${threads}`}
                   className="hover:text-primary hover:underline dark:text-primary-dark flex flex-row items-center">
-                  <IconThreads className="pe-1" />
+                  <IconThreads className="pe-1" aria-hidden="true" />
                   {threads}
                 </ExternalLink>
               </div>
@@ -135,27 +135,27 @@ export function TeamMember({
                   aria-label={`${name} on Bluesky`}
                   href={`https://bsky.app/profile/${bsky}`}
                   className="hover:text-primary hover:underline dark:text-primary-dark flex flex-row items-center">
-                  <IconBsky className="pe-1" />
+                  <IconBsky className="pe-1" aria-hidden="true" />
                   {bsky}
                 </ExternalLink>
               </div>
             )}
             {github && (
               <div className="me-4">
                 <ExternalLink
-                  aria-label="GitHub Profile"
+                  aria-label={`${name} on GitHub`}
                   href={`https://github.com/${github}`}
                   className="hover:text-primary hover:underline dark:text-primary-dark flex flex-row items-center">
-                  <IconGitHub className="pe-1" /> {github}
+                  <IconGitHub className="pe-1" aria-hidden="true" /> {github}
                 </ExternalLink>
               </div>
             )}
             {personal && (
               <ExternalLink
-                aria-label="Personal Site"
+                aria-label={`${name}'s personal site`}
                 href={`https://${personal}`}
                 className="hover:text-primary hover:underline dark:text-primary-dark flex flex-row items-center">
-                <IconLink className="pe-1" /> {personal}
+                <IconLink className="pe-1" aria-hidden="true" /> {personal}
               </ExternalLink>
             )}
           </div>