Update docs nav link to point to Microsoft Learn (#32)

* Initial plan

* Update docs navigation link from aka.ms/devproxy to Microsoft Learn

Co-authored-by: waldekmastykarz <11164679+waldekmastykarz@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: waldekmastykarz <11164679+waldekmastykarz@users.noreply.github.com>

Author: Copilot

src/layouts/Layout.astro

@@ -57,7 +57,7 @@ const ogImage = image ? new URL(image, Astro.site ?? 'https://devproxy.net').hre
           <a href={`${import.meta.env.BASE_URL}`} class="hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Home</a>
           <a href={`${import.meta.env.BASE_URL}blog/`} class="hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Blog</a>
           <a href={`${import.meta.env.BASE_URL}samples/`} class="hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Samples</a>
-          <a href="https://aka.ms/devproxy" target="_blank" rel="noopener" class="hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Docs ↗</a>
+          <a href="https://learn.microsoft.com/microsoft-cloud/dev/dev-proxy/overview" target="_blank" rel="noopener" class="hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Docs ↗</a>
           <div class="flex items-center gap-3 ml-2 border-l pl-4" style="border-color: var(--border-primary);">
             <a href="https://github.com/dotnet/dev-proxy" target="_blank" rel="noopener" class="hover:text-purple-400 transition-colors" style="color: var(--text-muted);" title="GitHub" aria-label="Dev Proxy on GitHub">
               <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24" aria-hidden="true">
@@ -105,7 +105,7 @@ const ogImage = image ? new URL(image, Astro.site ?? 'https://devproxy.net').hre
           <a href={`${import.meta.env.BASE_URL}`} class="py-2 hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Home</a>
           <a href={`${import.meta.env.BASE_URL}blog/`} class="py-2 hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Blog</a>
           <a href={`${import.meta.env.BASE_URL}samples/`} class="py-2 hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Samples</a>
-          <a href="https://aka.ms/devproxy" target="_blank" rel="noopener" class="py-2 hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Docs ↗</a>
+          <a href="https://learn.microsoft.com/microsoft-cloud/dev/dev-proxy/overview" target="_blank" rel="noopener" class="py-2 hover:text-purple-400 transition-colors" style="color: var(--text-muted);">Docs ↗</a>
         </div>
       </div>
     </nav>