* POC of blog post folder
* add parseBlogFileName with tests + refactor and extract processBlogSourceFile in separate method
* improve blog date pattern doc + link from content plugin guides to API ref docs
* Some FrontMatter fields should be able to reference relative image assets, converted to Webpack require calls and exposed as frontMatterAssets
* remove log
* extract createExcerpt code in separate file + add bad test
* almost working markdown parsing refactor
* complete parseMarkdownString refactor
* fix tests
* fix blog test issue
* fix docusaurus utils imports