Kapa: remove duplicate initialization

[LinasKo]

Description

This is a tiny change that removes duplicate initialization of the Kapa widget.

With duplicate initialization no Roboflow logo is displayed on the chat button, and attempts to chat with the agent result in a configuration error message.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How has this change been tested, please provide a testcase or example of how you tested the change?

Tested by checking out mkdocs and chatting with the agent.

Any specific deployment considerations

For example, documentation changes, usability, usage/costs, secrets, etc.

Docs

• Docs updated? What were the changes:

[LinasKo]

The open question remains - is it good enough for us to keep it as is? We'll likely remove it before the release so we can test it properly.