refs https://github.com/TryGhost/Product/issues/4152
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### <samp>🤖[[deprecated]](https://githubnext.com/copilot-for-prs-sunset)
Generated by Copilot at a28462f</samp>
This pull request adds a new admin-x app called `admin-x-demo`, which
demonstrates how to use the shared packages `admin-x-framework` and
`admin-x-design-system` to create a simple app that renders a button and
a modal. It also improves the development workflow, the vite
integration, the dependency management, and the type checking for the
admin-x apps and packages. It modifies some files in the
`admin-x-framework` and `admin-x-design-system` packages to make the
modals prop optional, to introduce a new type for the props from the
Ember app, to fix the z-index of the modal backdrop, and to use
consistent file extensions and module syntax.
refs https://github.com/TryGhost/DevOps/issues/104
- `info` is very verbose as it prints all files and their sizes
- we often don't care about this, so we can do away with `info` in favor
of `warn`
refs https://vitejs.dev/config/build-options.html#build-reportcompressedsize
- this should make building a little bit quicker because it doesn't have
to calculate the gzip size (I don't think we're likely to hit this
because we don't have large projects, but it's still nice to clean up
the output)
refs https://github.com/TryGhost/Product/issues/4123
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### <samp>🤖 Generated by Copilot at a420f0b</samp>
This pull request moves most of the API-related types and functions from
the `admin-x-settings` package to the `admin-x-framework` package, which
is a new library of common utilities and hooks for the admin-x apps. It
also adds some configuration files, such as `.eslintrc.cjs` and
`.gitignore`, to the `admin-x-framework` package. Additionally, it
exports the `FetchKoenigLexical` type from the `admin-x-design-system`
package, which is used by the `HtmlEditor` component.
