Available Skaffold docker images - add more detail

### Expected behavior
As user, I want to find more information about the available Skaffold docker images in [skaffold.dev](https://skaffold.dev/) web page: what they have, tools included, when are those updated, etc.

### Actual behavior
Right now, the only information we have related to the available docker images is under https://skaffold.dev/docs/install/#standalone-binary.

### Information
We can add more information about the images created in the different moments of our CI/CD process:

- Tools included in the images, e.g, gcloud, docker, kpt, etc
- When are the images created: lts images vs latest vs edge
- Tagging strategies used when are created
- etc

We'll need to check if we want to add that information in the same https://skaffold.dev/docs/install/#standalone-binary section, or add a new one.