fix: website build

[chengcyber]

Basic Checks

Have you run rush change for this change?

• Yes
• No

If No, please run rush change before, this is necessary.

If adding a new feature, the PR's description includes:

• Reason for adding this feature
• How to use
• A basic example

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

Summary

Patch lunr.utils.warn to use console.log instead of console.warn

Detail

Lunr prints error message with console.warn which print on stderr. The messages are treated as error message by rush build

After patching the code of lunr, it uses console.log to print the message.

How to test it

Local