[PE-45] feat: page export as PDF & Markdown

[aaryan610]

What's new?

A page can now be exported as a PDF and Markdown file.

Media:

https://github.com/user-attachments/assets/8e1ddecc-2936-4b8a-a6ad-6a20bb253d6a

Other improvements:

1. Updated the default font-family of all the editors.

Plane issue: PE-45

Summary by CodeRabbit

Release Notes

• New Features

  • Introduced a new ExportPageModal for exporting content in PDF and Markdown formats.
  • Added a PDFDocument component for rendering PDF documents.
  • Expanded modal width options with new constants for SM, MD, and LG.

• Improvements

  • Updated font styling for a more specific font stack in the editor.
  • Enhanced content processing for HTML and Markdown to ensure compatibility during exports.

• Bug Fixes

  • Streamlined rendering logic by removing unnecessary style properties in the title component.