Refactor Project Structure and Add New GraphQL Features

[Wreck-X]

Pull Request Description

This pull request refactors the project structure to enhance modularity and maintainability while also adding new GraphQL features. The code is reorganized into a more logical and cohesive format, separating concerns and making it easier to manage and extend in the future. Key changes and new additions include:

Consolidation of database models into a single db.rs file.
Consolidation of GraphQL resolvers (queries and mutations) into a single graphql.rs file.
Clear separation of configuration and routes into config.rs and routes.rs respectively.
Added new GraphQL queries and mutations for retrieving users and attendance, and for adding members.

Summary of Changes

src/db.rs: Contains database models for Member and Attendance.
src/graphql.rs: Contains GraphQL resolvers for queries and mutations.
src/config.rs: (Placeholder for any configuration-related code).
src/routes.rs: Contains route definitions and GraphiQL setup.
src/main.rs: Main application setup, including database migration and server initialization.

New Additions

GraphQL Queries:
    get_users: Fetches a list of users.
    get_attendance: Fetches attendance records for a given date.
GraphQL Mutation:
    add_member: Adds a new member to the database.

[ivinjabraham]

Looks good but please commit more frequently and add documentation.