Link to Harmony in README is dead

[harry-xm]

Describe the bug
https://harmonyapp.io/ now points to a scam site.

To Reproduce
Open README and click the Harmony link.

Expected behavior
Link updated or removed along with the integration.

Screenshots/debug logs
N/A

Environment (please complete the following information):

• OS: macOS
• Matterbridge version: N/A
• If self compiled: N/A

Additional context
N/A