website/developer-docs: note that hack registration is closed (#6414)

* edit

* remove announcement bar too

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
Co-authored-by: Tana Berry <tana@goauthentik.io>
Co-authored-by: Jens Langhammer <jens@goauthentik.io>

website/developer-docs/hackathon/index.md

@@ -4,6 +4,10 @@ title: Hackathon 2023
 
 ![hackathon-image](./horizontal-brandon-frie-rdHeGGn7rwQ-unsplash.jpg)
 
+**REGISTRATION NOW CLOSED! PLEASE JOIN US FOR A FUTURE AUTHENTIK HACKATHON.**
+
+^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
+
 ## Join us for our first authentik hackathon!
 
 Everyone welcome; we will work on code, docs, and anything else that looks interesting and challenging.
@@ -25,10 +29,6 @@ July 26-30, 2023
 
 Online, in our [GitHub repo](https://github.com/goauthentik/authentik), and on Discord in our [#hackathon23 channel](https://discord.com/channels/809154715984199690/1110948434552299673) for our Kickoff call, checkins, and the wrap-up and awards events. We will also use the #hackathon23 channel throughout the entire five days, for questions and general chatting. Be sure to first visit our [welcome-info-rules channel](https://discord.com/channels/809154715984199690/813452440660606986), to review our code of conduct and see the latest posts about the hackathon.
 
-## Registration form
-
-Use the [Hackathon 2023 Registration Form](https://docs.google.com/forms/d/e/1FAIpQLSc10MiK4li-SIY8SidhwFEwFbDcna-fio1xFY2nmimqXPPvLA/viewform) to let us know that you'll join us!
-
 ## Take a look on GitHub
 
 If you already know what you and/or your team want to work on, you can open an [Issue](https://github.com/goauthentik/authentik/issues) using our template for all hackathon Issues at any time (why not now?) and add the `hackathon` label. Then, when you register, enter the Issue number that you opened on your registration form. This way, on Kickoff Day we can easily match particpants with their Issue of interest.

website/docusaurus.config.js

@@ -83,13 +83,6 @@ module.exports = async function () {
                     },
                 ],
             },
-            announcementBar: {
-                id: "hackathon",
-                content: `We're hosting a hackathon with a total prize pool of $5000 in July! Sign up <a href="https://goauthentik.io/developer-docs/hackathon/">here</a>!`,
-                backgroundColor: "#ffffff",
-                textColor: "#000000",
-                isCloseable: false,
-            },
             footer: {
                 links: [
                     {