remove docgen package

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/getting-started/project-structure.md

@@ -147,11 +147,6 @@ are separated out into their own folder, see further down.
   Helps you setup a plugin for isolated development so that it can be served
   separately.
 
-- [`docgen/`](https://github.com/backstage/backstage/tree/master/packages/docgen) -
-  Uses the
-  [TypeScript Compiler API](https://github.com/microsoft/TypeScript/wiki/Using-the-Compiler-API)
-  to read out definitions and generate documentation for it.
-
 - [`e2e-test/`](https://github.com/backstage/backstage/tree/master/packages/e2e-test) -
   Another CLI that can be run to try out what would happen if you build all the
   packages, publish them, create a new app, and then run them. CI uses this for

docs/overview/stability-index.md

@@ -145,12 +145,6 @@ Provides utilities for developing plugins in isolation.
 
 Stability: `0`. This package is largely broken and needs updates.
 
-### `docgen` [GitHub](https://github.com/backstage/backstage/tree/master/packages/docgen/)
-
-Internal CLI utility for generating API Documentation.
-
-Stability: `N/A`
-
 ### `e2e-test` [GitHub](https://github.com/backstage/backstage/tree/master/packages/e2e-test/)
 
 Internal CLI utility for running e2e tests.