Content: Custom Forms for Multi-User Dashboards

### Original Issue URL

https://discourse.nodered.org/t/multiple-input-elements-form-into-one-message/86062/7?u=joepavitt

### Description

**Content Overview:**

- Turn the discussion linked above into a blog article
- Target audience: Dashboard 2.0 users, and up-selling the FF Auth plugin
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**Detailed Description:**

Walkthrough of the flow I shared in that forum post. It's a neat use case and uses some `[msg]` tricks I wasn't aware of that @Steve-Mcl demonstrated, which would provide a very powerful mechanic for the multi-user Dashboards generally, demonstrated here with forms.

### Demo Link

_No response_

### Expected Live Date

_No response_