Fixes network error seed behavior

[mmazur122]

docs: added instructions for running gqmock as a HTTP server for local development

docs: added docs for mock server endpoints

Description

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• Fixes network error seeds behavior
• Added docs for mock server endpoints
• Added docs for running GQMock as an HTTP server for local development

Type of Change

• [x] Bug Fix
• [ ] New Feature
• [ ] Breaking Change
• [ ] Refactor
• [x] Documentation
• [ ] Other (please describe)

Checklist

• [x] I have read the contributing guidelines
• [x] Existing issues have been referenced (where applicable)
• [x] I have verified this change is not present in other open pull requests
• [x] Functionality is documented
• [x] All code style checks pass
• [x] New code contribution is covered by automated tests
• [x] All new and existing tests pass