Document a list of available foundation components

[janechu]

Description

The FAST components are being deprecated and as part of that story, the styles and references to templates are moving to the CLI. Enabling the creation of styled foundation components requires that a documented list of available components must be added.

Requirements

• Fill out the documentation for available foundation components in the documentation site and link to the foundation category listed in the specification https://github.com/microsoft/fast-cli/blob/main/specs/fast-cli.md#add-a-component