chore: update announcement bar with openFeature summit (#780)

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## This PR
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- update announcement bar with openFeature summit

### Related Issues
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Fixes #778

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Signed-off-by: thisisobate <[email protected]>

Author: thisisobate

docusaurus.config.ts

@@ -95,7 +95,7 @@ const themeConfig: ThemeCommonConfig & AlgoliaThemeConfig = {
   announcementBar: {
     id: 'announcing-angular-sdk',
     content:
-      'Psst! We\'ve released a brand new SDK for Angular. Read more <a href="/blog/announcing-angular-sdk">here</a>!',
+      'Psst! We\'re excited to kick off the very first OpenFeature Summit. Read more <a href="https://events.linuxfoundation.org/kubecon-cloudnativecon-north-america/co-located-events/openfeature-summit/">here</a>!',
   },
   footer: {
     style: 'dark',