Add Cheatsheet category view

[michaelborn]

Allow users to browse a "Cheatsheet" page.

• Group snippets by a new cheatsheet field.
• Add new ES document type of "cheatsheet" with title, subtitle, and description fields.
• Build a nice beautiful landing page for these cheatsheets.

Example:

Datasources Cheatsheet

Copy-paste datasource config structs for easy copy-paste database setup in Lucee server

• [H2 dsn]
• [Postgres dsn]
• [MSSQL dsn]