Bugfix/updated schema for search-get_article

Closes #29

Summary by Sourcery

This pull request updates the GraphQL schema to use a new fragment for search results, adds an optional parameter to fetch article content, fixes a minor README formatting issue, and enhances the test coverage for article fetching.

Bug Fixes:
- Updated the GraphQL schema to use the new 'SearchItemFields' fragment, ensuring consistency and completeness of the search results.
Enhancements:
- Added 'includeContent' parameter to the 'get_article' method to allow fetching article content optionally.
Documentation:
- Fixed a minor formatting issue in the README.md file.
Tests:
- Enhanced the 'test_get_articles' test to check for the presence of 'id' and 'content' fields in the search results.

Reviewer's Guide by Sourcery

This pull request addresses issue #29 by updating the GraphQL schema to use a fragment for the Search query, improving reusability and maintainability. It also adds support for including content in the get_article method and updates the corresponding tests to verify this functionality. Additionally, a minor fix was made to the README.md file to correct a duplicated header.

File-Level Changes

Files	Changes
`omnivoreql/queries/Search.graphql` `omnivoreql/omnivoreql.py`	Updated the Search query to use a fragment for better reusability and added support for including content in the get_article method.
`tests/test_omnivoreql.py` `omnivoreql/omnivoreql.py`	Enhanced the test_get_articles test to verify the inclusion of content and updated the get_article method to support the new include_content parameter.

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yazdipour / OmnivoreQL