Support design tools integration in addition to Markdown Editor

[devleejb]

What would you like to be added:
Integrate design tools in addition to the Markdown Editor in the platform. For example, Obsidian allows managing design documents along with notes using plugins.

One of the suggested options is to implement the integration using an open-source tool called Excalidraw.

Why is this needed:
Enabling the integration of design tools will enhance the functionality of the platform, providing users with the ability to work on design documents seamlessly alongside their notes.

Reference:

• Excalidraw GitHub Repository
• Obsidian Excalidraw Plugin Repository