Replace description fields with NcRichText

[Chartman123]

Is your feature request related to a problem? Please describe.
Currently we're using a custom textarea with markdown-it for allowing Markdown in descriptions.

Describe the solution you'd like
Use a default field type from nextcloud-vue library to reduce (direct) external dependencies. --> NcRichText

Describe alternatives you've considered
Keep everything as-is.

Additional context
https://nextcloud-vue-components.netlify.app/#/Components/NcRichText

[vishruthasgowda]

"Hi, I'd like to work on this as a first contribution — could I be assigned?"

[Chartman123]

@vishruthasgowda thanks for your reply :) We'd be glad if you want to give it a try 👍🏻