Customize Notifications page

[w0rd-driven]

• [x] Style subject, body, type icon, and seen_at timestamp.
  • [x] This should be rounded alternating sections like the .table component but always visible vs on hover. It should be 100% identical to how the sidebar looks.
  • [x] Use my blog's yellow color, it should be perfect if it's kept light.
  • [x] Icons for each type, not_owned, new_release, and upcoming_release.
• [ ] Search filter by string for the title
• [ ] Dropdown to filter by type enum
• [x] Mark as read
• [x] Update notification count on read
• [ ] Next: Multi-select mark as read

[w0rd-driven]

All actions should be taken from the index page. We can rip out show and the rest. It would also make sense to rename the page.