feat: add models related to site data to filament admin (resolves #2080)

[jobara]

Resolves #2080

• Adds the following models to filament admin: AccessSupport, ContentType, Impact, Language, PaymentType, Sector
• Re-organized filament related tests
• Updated filament listing pages to be more consistent across models
• Updated Privacy Policy and Terms of Service seeders from production data
  • Added email_privacy as an expansion option for Pages and added it to the website settings
  • Added a markdown extension in the PageController to add ids to headings so that they can be linked
  • Added a Table of Contents to Privacy Policy and Terms of Service
• Configured the test database so that it would be easier to run migrations against and updated the README instructions.

Prerequisites

If this PR changes PHP code or dependencies:

• [x] I've run composer format and fixed any code formatting issues.
• [x] I've run composer analyze and addressed any static analysis issues.
• [x] I've run php artisan test and ensured that all tests pass.
• [x] I've run composer localize to update localization source files and committed any changes.

If this PR changes CSS or JavaScript code or dependencies:

• [x] I've run npm run lint and fixed any linting issues.
• [x] I've run npm run build and ensured that CSS and JavaScript assets can be compiled.