feat: json generator implmentation along with a site wide search bar,…

[bwaklog]

Addressing issue #62 [Json Generator]

• Added GenerateMergedJson method to the engine package
• Added unit tests for GenerateMergedJson
• Added site wide search from Adhesh's branch
• Update docs.md

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[anirudhsudhir]

Made some minor changes:

• Changed function and filename from "GenerateMergedJson()" and "merged.json" to "GenerateJSONIndex()" and "index.json"
• Updated comments
• Fixed spellings
• Split search functionality into a new partial

[anirudhsudhir]

Implemented deep data merge

• Copy generated JSON index to the Engine struct
• Add authors field to Frontmatter
• Updated tests