Render Markdown (in NOTEs).

[RokeJulianLockhart]

Is your feature request related to a problem? Please describe.

I use my contacts like a CRM in that I store more than the bare minimum about a few people, because I need to for work. This has necessitated that I organize it somewhat, so in lieu of having to move this information into dedicated documents linked to in the NOTE section for each person, I want to use Markdown directly in the NOTE section.

Describe the solution you'd like

Render Markdown in at least the NOTE section.

Describe alternatives you've considered

Render HTML.

Additional context

1. Counterpart to Render Markdown (in NOTEs). FossifyOrg/Contacts#86 (comment).
2. Example at Render Markdown (in NOTEs). you-apps/ConnectYou#215 (comment).