feat(website): add accessibility link, update common js (#3155)

* feat(footer): add accessibility link

* fix(cookies): remove defer from script

* fix(common): move to post body components

* fix(common): remove defer

* fix(common): unique name

* fix(common): re-add defer

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

gatsby-ssr.js

@@ -1,6 +1,6 @@
 import React from 'react';
 
-export const onRenderBody = ({ setHeadComponents }) => {
+export const onRenderBody = ({ setHeadComponents, setPostBodyComponents }) => {
   const script = `
   if(!window) window = {};
   window.idaPageIsSPA = true;
@@ -20,7 +20,7 @@ export const onRenderBody = ({ setHeadComponents }) => {
     },
   }`;
 
-  return setHeadComponents([
+  setHeadComponents([
     <meta key="image" name="image" content={'/ogimage.png'} />,
     <meta
       key="og:url"
@@ -68,6 +68,9 @@ export const onRenderBody = ({ setHeadComponents }) => {
       key="fathom"
       defer
     />,
+  ]);
+
+  setPostBodyComponents([
     <script key="digital-data" dangerouslySetInnerHTML={{ __html: script }} />,
     <script
       defer

src/gatsby-theme-carbon/components/Footer/index.js

@@ -40,6 +40,7 @@ const links = {
     },
     { href: 'https://www.ibm.com/privacy', linkText: 'Privacy' },
     { href: 'https://www.ibm.com/legal', linkText: 'Terms of use' },
+    { href: 'https://www.ibm.com/able', linkText: 'Accessibility' },
     { href: 'https://www.ibm.com/', linkText: 'IBM.com' },
   ],
   secondCol: [