Fix broken link in hosted-quickstart.mdx

[arpagon]

The link to the Hosted Walkthrough in docs/hosted-quickstart.mdx is broken. It currently points to '/getting-number' but should point to '/walkthrough_intro' or './walkthrough_intro'.

Current: Hosted Walkthrough

Should be: Hosted Walkthrough

or

Hosted Walkthrough

File to update: docs/hosted-quickstart.mdx

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions[bot]]

This issue has been automatically closed due to inactivity. Thank you for your contributions.