Refactor query implementation for the Graph's service migration

[evandrosaturnino]

Description

Refactor the querying implementation in response to The Graph's recent transition from the hosted-service to the Studio service.

Key changes include:

Updated query format to be compatible with The Graph Studio services. Introduced requirements for a subgraph ID and a subgraph API key secret to authenticate queries.

These changes are necessary to maintain our application's connectivity with The Graph's services and ensure seamless data querying.

• [x] update subgraph service querying implementation

Notice

• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Pull Request Type

• [x] New Feature (Breaking/Non-breaking Change)

Fixes #121

Testing

Please outline all testing steps

1. Clone the repo - git clone https://github.com/threshold-network/website.git
2. Install dependencies - yarn install
3. Build the app - yarn build
4. Run the app - yarn start

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