Remove unused <Helper />, add TheGraph signup link

app/src/components/mdx/Note.tsx

@@ -2,7 +2,7 @@ import { InfoIcon } from '../icons/InfoIcon';
 
 export const Note = ({ children }) => {
     return (
-        <div className="dark:border-ens-500/30 my-6 flex gap-2.5 rounded-2xl border border-ens-light-border bg-ens-light-blue-50/50 p-4 leading-6 text-ens-light-blue-900 dark:border-ens-dark-border dark:bg-ens-light-blue-500/5 dark:text-ens-light-blue-200 dark:[--tw-prose-links-hover:theme(colors.ens.light.blue.300)] dark:[--tw-prose-links:theme(colors.white)]">
+        <div className="dark:border-ens-500/30 border-ens-light-border bg-ens-light-blue-50/50 text-ens-light-blue-900 dark:border-ens-dark-border dark:bg-ens-light-blue-500/5 dark:text-ens-light-blue-200 my-6 flex gap-2.5 rounded-2xl border p-4 leading-6 dark:[--tw-prose-links-hover:theme(colors.ens.light.blue.300)] dark:[--tw-prose-links:theme(colors.white)]">
             <InfoIcon className="fill-ens-500 dark:fill-ens-200/20 dark:stroke-ens-200 mt-1 size-4 flex-none stroke-white" />
             <div className="[&>:first-child]:mt-0 [&>:last-child]:mb-0">
                 {children}

docs/web/subgraph.mdx

@@ -1,5 +1,5 @@
 import { WIP } from '@/components/wip/WIP'
-import { Helper } from '@/components/Helper'
+import { Note } from '@/components/mdx/Note'
 
 {/* * @type {import('@/lib/mdxPageProps').MdxMetaProps} */}
 export const meta = {
@@ -19,11 +19,11 @@ This is a page covering the graph's ENS subgraph.
 The Graph is a protocol for indexing and querying data from blockchains. There are multiple subgraphs that you can use to query information about ENS names.
 These subgraphs are available for [mainnet](https://api.thegraph.com/subgraphs/name/ensdomains/ens), [sepolia](https://api.studio.thegraph.com/query/49574/enssepolia/version/latest) and [holesky](https://api.studio.thegraph.com/query/49574/ensholesky/version/latest).
 
-<Helper type="warning">
+<Note>
   Developers are welcome to use our rate limited API endpoints above for
-  testing, but it is highly encouraged to sign up for a free account with
-  TheGraph to get your own API key.
-</Helper>
+  testing, but it is highly encouraged to [sign up for a free account with
+  TheGraph](https://thegraph.com/studio/apikeys/) to get your own API key.
+</Note>
 
 ## GraphQL Schema