Add a health indicator for each package

[irongut]

Feature Request

Add a new column containing an indicator of the "health" of the individual packages using a similar scheme to the badge: less than 50%, 50% - 74%, greater than 75%.

Expected Behaviour

• Use emojis as a health indicator for each package. e.g.: ❌ / ☑ / ✅ or ❌ / ➖ / ✔ or 🔴 / 🟡 / 🟢
• Add a parameter to enable, default true.

Additional Context

Linked To

#15 Add ability to change badge + health indicator thresholds

[irongut]

Using ❌ / ➖ / ✔ for accessibility.
Also added health indicator to summary & changed text output to be more like markdown output.