Add Notes Section

[Lettify]

This pull request introduces enhancements to the function schema, improves the rendering and styling of function pages, and refines the utility functions for handling function data. Key changes include the addition of new schema properties, the implementation of a reusable NoteBox component, and updates to the getFunctionInfo utility for better type definitions and data handling.

Schema Enhancements:

• Added an important_notes field to the function schema, which is an array of strings for capturing additional information about a function. (schemas/function.yaml schemas/function.yamlR46-R53)
• Introduced an optional boolean property for function parameters, indicating whether a parameter is optional. (schemas/function.yaml schemas/function.yamlR174-R177)

UI Improvements:

• Created a reusable NoteBox component for displaying styled notes on function pages. (web/src/components/NoteBox.astro web/src/components/NoteBox.astroR1-R21)
• Integrated the NoteBox component and added sections for notes and examples on function pages, improving content organization and readability. (web/src/pages/[func].astro web/src/pages/[func].astroL22-R48, web/src/pages/[func].astroR57-R85)
• Added new CSS styles for notes, examples, and function-specific sections to enhance the visual presentation. (web/src/styles/function-page.css web/src/styles/function-page.cssR1-R26)

Utility Function Enhancements:

• Refactored getFunctionInfo to include new schema fields (important_notes, parameters) and improved type definitions for better maintainability. (web/src/utils/functions.ts web/src/utils/functions.tsL36-R85)
• Updated the logic for categorizing functions by type and folder, ensuring compatibility with the revised schema. (web/src/utils/functions.ts web/src/utils/functions.tsL58-R106)