chore: updated community Slack invite link (#236)

## PR Checklist
- [x] Linked issue added (e.g., `Fixes #123`)
- [x] I have run `bun run format` to ensure code is properly formatted
- [x] I have verified that `bun run lint` passes without errors
- [ ] If blog post was added:
  - [ ] Ensure images have been optimised
- [ ] Update dates to reflect the actual publishing date when merged
(file names, folder names, and frontmatter)

## Summary
<!-- What has been updated and why -->
Updated the link for joining the community Slack.
Fixes INTORG-961

Author: JoblersTune

src/components/blog/CommunityLinks.astro

@@ -9,8 +9,8 @@
     href="https://github.com/interledger/">GitHub</a
   >. If the work mentioned here inspired you, we welcome your contributions. You
   can join our <a
-    href="https://communityinviter.com/apps/interledger/interledger-working-groups-slack"
-    >community slack</a
+    href="https://join.slack.com/t/interledger/shared_invite/zt-44g089zrn-XdSIiHF~cs8Oo_MBmSfECA"
+    >community Slack</a
   > or participate in the next <a
     href="https://docs.google.com/document/d/1T_Q_eRZtL8GluJR9rVADd7fvkB8mPluMk-d96LM4vlg/edit?usp=sharing"
     >community call</a

src/components/pages/Footer.astro

@@ -19,7 +19,7 @@ const currentYear = new Date().getFullYear()
     </li>
     <li>
       <a
-        href="https://communityinviter.com/apps/interledger/interledger-working-groups-slack"
+        href="https://join.slack.com/t/interledger/shared_invite/zt-44g089zrn-XdSIiHF~cs8Oo_MBmSfECA"
         ><img src="/developers/img/lander/icon-slack.svg" alt="Slack" /></a
       >
     </li>

src/components/pages/FoundationFooter.astro

@@ -102,7 +102,7 @@ const currentYear = new Date().getFullYear()
         </li>
         <li>
           <a
-            href="https://communityinviter.com/apps/interledger/interledger-working-groups-slack"
+            href="https://join.slack.com/t/interledger/shared_invite/zt-44g089zrn-XdSIiHF~cs8Oo_MBmSfECA"
             aria-label="Interledger Community Slack"
             data-umami-event="Footer - Slack"
           >

src/content/blog/2024-10-11-where-did-rafiki-money-go.mdx

@@ -103,4 +103,4 @@ Our initial aim was to retain all active users with registered emails on rafiki.
 
 We truly hope you enjoy this new design as much as we do! We look forward to your [feedback and opinion](https://github.com/interledger/testnet/discussions)! Don’t be shy!
 
-We put our heart and soul into making it both fun and user-friendly. So continue exploring wallet.interledger-test.dev and boutique.interledger-test.dev, and remember, we value and welcome all your feedback! Reach out to us either on [Slack community channels](https://communityinviter.com/apps/interledger/interledger-working-groups-slack), or open a discussion on [Github Test Wallet](https://github.com/interledger/testnet/discussions).
+We put our heart and soul into making it both fun and user-friendly. So continue exploring wallet.interledger-test.dev and boutique.interledger-test.dev, and remember, we value and welcome all your feedback! Reach out to us either on [Slack community channels](https://join.slack.com/t/interledger/shared_invite/zt-44g089zrn-XdSIiHF~cs8Oo_MBmSfECA), or open a discussion on [Github Test Wallet](https://github.com/interledger/testnet/discussions).

src/content/blog/2026-03-26-rafiki-integrator-guide.mdx

@@ -127,7 +127,7 @@ When Rafiki sends a webhook to the ASE, it expects a 200 response. Otherwise, it
 
 Hopefully, this provided you a good starting point to complete your first payment!
 
-If you have other questions, we invite you to join our community [Slack channel](https://communityinviter.com/apps/interledger/interledger-working-groups-slack), and attend our [Rafiki community calls](https://github.com/interledger/rafiki?tab=readme-ov-file#community-calls) every third Tuesday of the month at 14:30 UTC.
+If you have other questions, we invite you to join our community [Slack channel](https://join.slack.com/t/interledger/shared_invite/zt-44g089zrn-XdSIiHF~cs8Oo_MBmSfECA), and attend our [Rafiki community calls](https://github.com/interledger/rafiki?tab=readme-ov-file#community-calls) every third Tuesday of the month at 14:30 UTC.
 
 ## FAQ
 

src/content/docs/get-involved.md

@@ -6,7 +6,7 @@ We appreciate your interest in contributing to Interledger and welcome contribut
 
 ## Contributing to Interledger
 
-If you are new to Interledger and are not sure where your skills can be applied, we hope that the following list can help you get started. And we welcome your questions and feedback in [our Slack channel](https://communityinviter.com/apps/interledger/interledger-working-groups-slack). Many of these projects also host community calls; you can find details in their respective GitHub repository READMEs.
+If you are new to Interledger and are not sure where your skills can be applied, we hope that the following list can help you get started. And we welcome your questions and feedback in [our Slack channel](https://join.slack.com/t/interledger/shared_invite/zt-44g089zrn-XdSIiHF~cs8Oo_MBmSfECA). Many of these projects also host community calls; you can find details in their respective GitHub repository READMEs.
 
 If you have experience maintaining and contributing to **open-source projects**, we would love to have you get involved with any of the following projects.