feat: Add "Was this page helpful?" feedback widget

**Description**
Introduce a simple analytics/feedback mechanism at the bottom of documentation pages to gauge content quality and helpfulness.

**Proposed Solution**
A minimal footer widget consisting of:
- UI Component: A minimal footer widget consisting of the text prompt "Was this page helpful?" alongside interactive feedback buttons: Yes (thumbs-up) and No (thumbs-down).
- Analytics Integration: When a button is clicked, trigger a custom analytics event through the analytics provider configured in the project's configuration file (e.g., Plausible, GA4, PostHog).
- Implementation Detail: Fire a custom goal/event payload containing the feedback value and the current page path:

**Example**