feat: Remove .gitignore and generated files for Tina CMS, add new GraphQL schema and queries

- Deleted .gitignore file.
- Added new generated GraphQL schema (_graphql.json) with definitions for SystemInfo, Folder, PageInfo, Node, Document, Connection, Query, and Mutation types.
- Introduced lookup (_lookup.json) for document types and their resolve types.
- Updated schema (_schema.json) to include collections and fields for pages.
- Generated client configuration (client.ts) for Tina CMS with appropriate API URL and token.
- Created prebuild configuration (config.prebuild.jsx) for Tina CMS with schema definitions.
- Added GraphQL fragments (frags.gql) for Pages.
- Implemented queries (queries.gql) for fetching pages and paginated connections.
- Updated static media file (static-media.json) to reflect current state.
- Generated TypeScript types (types.ts) for the new schema and queries.

Author: Lonimokio