Add HTML Metadata for GovTool Pages to Support Sharing

Add appropriate HTML metadata (e.g., Open Graph, Twitter Card tags) to all relevant GovTool pages so that when links are shared on social media platforms or communication tools, they display a proper preview snippet with a title, description, and thumbnail image.

### Acceptance Criteria
- [ ] Add `og:title`, `og:description`, and `og:image` tags to all relevant pages
- [ ] Add `twitter:card`, `twitter:title`, `twitter:description`, and `twitter:image` tags
- [ ] Metadata dynamically reflects the page content (e.g., specific governance action details when sharing that page)
- [ ] Verify previews render correctly on at least:
- Twitter/X
- Facebook
- LinkedIn
- Discord
- Slack
- [ ] Ensure fallback metadata for pages without dynamic content