docs: update Discord invite link in sharing page

Replaces outdated discord.gg/continue vanity link with discord.gg/vapESyrFmJ
for consistency with other documentation files.

Fixes #8448

Author: houssemzaier

docs/hub/sharing.mdx

@@ -7,7 +7,7 @@ description: "Connect with the Continue community to discover, share, and collab
 
 Join thousands of developers using Continue. Share experiences, get help, and contribute to the ecosystem.
 
-[Join our Discord Community →](https://discord.gg/continue)
+[Join our Discord Community →](https://discord.gg/vapESyrFmJ)
 
 ## Publishing