Feat/new design

[easylogic]

What this PR does / why we need it?

• new design codepair
• yorkie character status view
• modify markdown style
• calendar in workspace
• support markdown fold
• support mermaid viewer

https://user-images.githubusercontent.com/591983/234642416-b05ac041-dabe-4b0e-96a4-a8431787f742.mov

Any background context you want to provide?

What are the relevant tickets?

Fixes #

Checklist

• [x] Added relevant tests or not required
• [x] Didn't break anything