Add 'Was this page helpful?' feedback widget

[AmitoVrito]

Description

Add thumbs up/down feedback widget at bottom of each docs page.

What to do

• Create <PageFeedback /> React component
• Show thumbs up / thumbs down buttons
• Optionally collect text feedback
• Send data to GitHub issue, Google Form, or analytics
• Add to docs layout via Docusaurus swizzling

[AmitoVrito]

Thanks for your interest! I will assign it to you. Before you start, could you give the repo a ⭐ on the main repo (https://github.com/SynapseKit/SynapseKit)? It really helps with visibility for a new project. Looking forward to your PR!