DA-1354: Added test for the H1 content (#82)

* DA-1354: Added test for the H1 content

- Added cheerio and marked dependencies
- Implemented H1 validation against frontmatter title in markdown files
- Created utility functions for frontmatter extraction and H1 detection

* Update utils/extract_frontmatter_from_tutorial.js

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* DA-1354 fix: yaml.safeLoad is deprecated

* DA-1354 remove: the test case for more than 1 H1s

* DA-1354 fix: update H1 validation logic to allow for no H1 or a single H1, and add logging for generated files with mismatched titles

* DA-1354 refactor: remove logging for generated files in H1 validation function

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: VirajAgarwal1