[site/theme,site/home][s]: change logo to be icon only plus add credit to hero section and info on email signup.

* Also add guide to navbar.

site/components/Home/Hero.js

@@ -1,3 +1,5 @@
+import siteConfig from 'config/siteConfig'
+
 export function Hero() {
   return (
     <div className="pt-10 sm:pt-16 lg:pt-8 lg:pb-14 lg:overflow-hidden">
@@ -38,6 +40,20 @@ export function Hero() {
                   </div>
                 </form>
               </div>
+              <p className="mt-3 text-sm text-gray-300 sm:mt-4">
+                Get short updates as we release new material or review important developments.
+              </p>
+              <p className="mt-8 text-sm text-white uppercase tracking-wide font-semibold sm:mt-10">A project of
+                <a
+                  href={siteConfig.authorUrl}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                >
+                  <img src={siteConfig.authorLogo} alt={siteConfig.author} className="mx-1 h-6 inline" />
+                  Life Itself Labs
+                </a>
+                {' '} &amp; collaborators
+              </p>
             </div>
           </div>
           <div className="mt-12 -mb-16 sm:-mb-48 lg:m-0 lg:relative">

site/components/Layout.js

@@ -32,7 +32,8 @@ export default function Layout({ children, title='' }) {
             target="_blank"
             rel="noopener noreferrer"
           >
-            <img src={siteConfig.authorLogo} alt={siteConfig.author} className="ml-2 h-6 block" />
+            <img src={siteConfig.authorLogo} alt={siteConfig.author} className="mx-1 h-6 inline-block" />
+            {siteConfig.author}
           </a>
         </p>
       </footer>

site/config/navLinks.js

@@ -1,7 +1,8 @@
 const navLinks = [
   { href: '/about', name: 'About' },
-  { href: '/library', name: 'Library' },
+  { href: '/guide', name: 'Guide' },
   { href: '/claims', name: 'Claims' },
+  { href: '/library', name: 'Library' },
   { href: '/contribute', name: 'Contribute' },
 ]