website: Assets for external articles (#377)

* new assets

* Update sponsor message

Author: jemgillam

src/pages/index.mdx

@@ -37,16 +37,21 @@ headline="The next-generation planning and execution engine for GraphQL"
 
 Enables greater performance and efficiency via deeper integration into your existing Node.js or remote business logic, no matter the shape of your GraphQL schema.
 
-Gra<em>fast</em> is currently only available to sponsors whilst it is still undergoing heavy iteration; sign up as a sponsor to get access.
+**Gra<em>fast</em> and PostGraphile V5 are in sponsors-only alpha; sponsor at any
+tier, then reach out for access.**
 
-Add yourself to our mailing list to be notified when Gra<em>fast</em> is made generally available under the MIT license.
-  
 <div class='df flex-row justify-center' style={{height: '3rem'}}>
 <div class='ph2 df flex-column justify-center'>
-<a class='button--outline' href='/sponsor/'><span class='fas fa-heart' /> Sponsor</a>{ ' '}
+<a class='button--outline' href='/sponsor/'><span class='fas fa-heart' /> Sponsor for access</a>{ ' '}
 </div>
+</div>
+
+
+Add yourself to our mailing list to be notified when Gra<em>fast</em> is made generally available under the MIT license.
+  
+<div class='df flex-row justify-center' style={{height: '3rem'}}>
 <div class='ph2 df flex-column justify-center'>
-<a class='button--solid' href='https://grafast.org' target="_new">grafast.org <span class='fas fa-external-link-square-alt' /></a>{ ' '}
+<a class='button--solid' href='https://grafast.org' target="_new">mailing list at grafast.org <span class='fas fa-external-link-square-alt' /></a>{ ' '}
 </div>
 </div>
 </MarketingProduct>

src/pages/sponsor.mdx

@@ -64,12 +64,11 @@ import Sponsors, { Sponsor } from "$components/MarketingSponsor";
 <Col span="6">
 <MarketingProduct
 big
-name={<span>Sponsor Gra<em>fast</em></span>}
+name={<span>Early access to Gra<em>fast</em> and PostGraphile V5</span>}
 headline="The next-generation planning and execution engine for GraphQL"
 >
 
-Grafast is currently only available to Graphile sponsors as it is still
-undergoing heavy iteration; sign up as a sponsor to get access to the binaries
+Gra<em>fast</em> and PostGraphile Version 5 are available as a preview to Graphile sponsors; sign up as a sponsor to get access to the binaries
 and documentation (sponsor at the Featured Tier for access to the repository,
 issues and support!)