Add how did you hear about us to sign-up form?

### Description

We recently added the 'What brings you to FlowForge' section on the sign-up page. It would be also useful to understand 'How they learned about FlowForge' since right now we are unable to capture this information with Hubspot.

I wonder if we know enough now about the reason why they want to use FlowForge that we swap the 'What brings you to FlowForge' to gain insight into how they learned about FlowForge. The options I would suggest are:
- Google search
- Node-RED website
- Other website (great to be able to capture input text for this one.
- LinkedIn
- Twitter
- Other social media
- Friend
- Work colleague
- YouTube video
- Other (free form text)

### Epic/Story

_No response_

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate