Explainer page for Gravwell versioning

[ashnwade]

What needs to be documented?

• Explain our versioning
• Explain the use of the Beta label within the product

Why is this documentation needed?

Discussed that the Beta label may mean different things to different people
Provide explicit documentation to explain our versioning and other related details (like the Beta label within the product)

Any other comments?

Here is an example of how Angular does it: https://angular.dev/reference/releases