Add markdown rendering

[karthik-Jay]

• [x] update profile model to read/write markdown string
• [x] update profile tab component to parse markdown string and render rich text

[karthik-Jay]

https://blog.logrocket.com/how-to-safely-render-markdown-using-react-markdown/

[karthik-Jay]

https://github.com/remarkjs/react-markdown

[karthik-Jay]

Scenarios to handle:

• plain text
• bold text
• italics
• underlines
• images
• headings
• lists - bullet or numbered