docs: initial cli docs skeleton + commands extraction

docs/cli/index.md

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+---
+id: index
+title: Overview
+description: Overview of the Backstage CLI
+---
+
+## Summary
+
+Backstage ships its own CLI tooling
+
+Tooling both for bundling deployment artifacts, as well as building individual
+packages for publishing.
+
+Under the hook we use [webpack](https://webpack.js.org/) for bundling,
+[rollup](https://rollupjs.org/) for building packages,
+[jest](https://jestjs.io/) for testing, and [eslint](https://eslint.org/) for
+linting.
+
+## Glossary
+
+- **Package** - A package in the Node.js ecosystem, often published to a package
+  registry such as [NPM](https://www.npmjs.com/).
+- **Monorepo** - A project layout that consists of multiple packages within a
+  single project, where packages are able to have local dependencies on each
+  other. Often enabled through tooling such as [lerna](https://lerna.js.org/)
+  and [yarn workspaces](https://classic.yarnpkg.com/en/docs/workspaces/)
+- **Local Package** - One of the packages within a monorepo. These package may
+  or may not also be published to a package registry.
+- **Bundle** - A collection of the deployment artifacts. The output of the
+  bundling process, which brings a collection of packages into a single
+  collection of deployment artifacts.