docs: replace spectrum with github discussions

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: 🙋 Ask a question
-    url: https://spectrum.chat/accounts-js
+    url: https://github.com/accounts-js/accounts/discussions
     about: Ask questions and discuss with other community members

README.md

@@ -55,8 +55,6 @@ The `@accounts` suite of packages aims to provide all the tools you need to buil
 
 ## Contributing and community
 
-[Join our Spectrum community](https://spectrum.chat/accounts-js) to get some help!
-
 Any contribution is very welcome, read our [contributing guide](CONTRIBUTING.md) to see how to locally setup the repository and see our development process.
 
 ## Sponsors

website/docusaurus.config.js

@@ -44,8 +44,8 @@ module.exports = {
           title: 'Community',
           items: [
             {
-              label: 'Spectrum',
-              href: 'https://spectrum.chat/accounts-js',
+              label: 'GitHub Discussions',
+              href: 'https://github.com/accounts-js/accounts/discussions',
             },
             {
               label: 'Slack',