Add documentation link to /help widget

## Improvement Request

In the `/help` slash command widget, we currently show "Press ctrl+p to see all available actions and commands in any context." We should also add a documentation link in this widget so users can quickly access the docs.

**Current behavior:**
The `/help` widget only displays a message about pressing ctrl+p for commands, with an OK button.

**Suggested improvement:**
Add a clickable documentation link in the help widget so users can easily navigate to the full docs directly from the help dialog.

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*Category: improvement*
*Submitted via altimate-code feedback*