feat(nav): rename Hosting link to 'Get a Plan'

More CTA-flavoured; differentiates from the WHP product mentioned
inside the docs.

src/components/SiteTitle.astro

@@ -22,7 +22,7 @@ const { siteTitleHref } = Astro.locals.starlightRoute;
   </a>
 
   <nav class="ext-nav" aria-label="AnHonestHost links">
-    <a href="https://anhonesthost.com/" class="ext-link">Hosting</a>
+    <a href="https://anhonesthost.com/" class="ext-link">Get a Plan</a>
     <a href="https://secure.anhonesthost.com/clientarea.php" class="ext-link">Client Portal</a>
   </nav>
 </div>

src/pages/index.astro

@@ -205,7 +205,7 @@ const visibleProducts: Product[] = Array.from(byProduct.entries())
         <span class="kb-label">Knowledge Base</span>
       </a>
       <nav class="ext-nav" aria-label="AnHonestHost links">
-        <a href="https://anhonesthost.com/" class="ext-link">Hosting</a>
+        <a href="https://anhonesthost.com/" class="ext-link">Get a Plan</a>
         <a href="https://secure.anhonesthost.com/clientarea.php" class="ext-link">Client Portal</a>
       </nav>
     </header>