Website: list the machine estimator — menu, sitemap, FAQ and apps-page links; R-997 closed

noindex and the robots Disallow lines removed; both URLs in the sitemap with their hreflang pair; the pair
moves from UNLISTED to TWINS in site_gates.py. The explaining sentence's base figure was already the drawn
box's base; a test now pins it (red-proved).

website/en/apps.html

@@ -79,6 +79,7 @@
                         <li><a href="/en/apps#home">Home &amp; Lifestyle</a></li>
                         <li><a href="/en/apps#productivity">Productivity &amp; Knowledge</a></li>
                         <li><a href="/en/apps#system">System &amp; Development</a></li>
+                        <li><a href="/en/sizing">Which machine do I need?</a></li>
                     </ul>
                 </li>
                 <li><a href="/en/technology"><svg class="ico" aria-hidden="true"><use href="/assets/icons.svg?v=1#i-layers"/></svg>Technology</a></li>
@@ -102,6 +103,7 @@
                 <h1>Apps to <span>install</span></h1>
             </div>
                 <p class="page-lede">Choose from 62 apps. Almost all of them are free, open-source software, and every one runs on your own server.</p>
+                <p class="page-lede"><a href="/en/sizing">How big a machine do these need? →</a></p>
                 <div class="disclaimer-banner">
                     <h3><svg class="ico-lg" aria-hidden="true"><use href="/assets/icons.svg?v=1#i-info"/></svg> Good to know</h3>
                     <ul>