Navaids: Add support for markdown descriptions

[jessica-woodland-scott-db]

Description

Included on the measurable category view

Resourcing

We would like to add this request to the Waltz team's feature backlog

[davidwatkins73]

We want to be able to rich information under nav aid diagrams. Currently the descriptions are just plain text but if we render them as markdown we can make them more useful. Initial uses include:

• legends (using colorful text)
• links to confluence etc

[jessica-woodland-scott-db]

[jessica-woodland-scott-db]

### Blueprint diagram (2023-07-20)

#### Legend
- <span style="color: red">&#x2B1B;&#xfe0e;</span> Data Types
- <span style="color: blue">&#x2B1B;&#xfe0e;</span> Capabilities

[jessica-woodland-scott-db]

Had to add ︎ to allow unicode character to inherit text colour

[davidwatkins73]

We are using bullet points for the legend as markdown tables stretch to 100% of the screen and don't look so good if there isn't much content.