TechDocs: Remove techdocs-container package from mono-repo (#3230)

* Move techdocs-container package to backstage/techdocs-container

* Clean up codeowners

* Remove unnecessary GitHub CI workflow

* Modify path in docs for techdocs-container

* Fix techdocs-cli URL

* Remove techdocs packages from docs/support/packages

docs/features/techdocs/FAQ.md

@@ -17,9 +17,8 @@ This page answers frequently asked questions about [TechDocs](README.md).
 
 TechDocs is using [MkDocs](https://www.mkdocs.org/) to build project
 documentation under the hood. Documentation built with the
-[techdocs-container](https://github.com/backstage/backstage/blob/master/packages/techdocs-container/README.md)
-is using the MkDocs
-[Material Theme](https://github.com/squidfunk/mkdocs-material).
+[techdocs-container](https://github.com/backstage/techdocs-container) is using
+the MkDocs [Material Theme](https://github.com/squidfunk/mkdocs-material).
 
 #### What is the mkdocs-techdocs-core plugin?
 

docs/features/techdocs/README.md

@@ -109,8 +109,8 @@ migrate Spotify's existing TechDocs features to open source.
 | ------------------------------------------- | -------------------------------------------------------- |
 | Frontend                                    | [`@backstage/plugin-techdocs`][techdocs/frontend]        |
 | Backend                                     | [`@backstage/plugin-techdocs-backend`][techdocs/backend] |
-| Docker Container (for generating doc sites) | [`packages/techdocs-container`][techdocs/container]      |
-| CLI (for local development)                 | [`packages/techdocs-cli`][techdocs/cli]                  |
+| Docker Container (for generating doc sites) | [`techdocs-container`][techdocs/container]               |
+| CLI (for local development)                 | [`@techdocs/cli`][techdocs/cli]                          |
 
 [getting started]: getting-started.md
 [concepts]: concepts.md
@@ -120,7 +120,5 @@ migrate Spotify's existing TechDocs features to open source.
   https://github.com/backstage/backstage/blob/master/plugins/techdocs
 [techdocs/backend]:
   https://github.com/backstage/backstage/blob/master/plugins/techdocs-backend
-[techdocs/container]:
-  https://github.com/backstage/backstage/blob/master/packages/techdocs-container
-[techdocs/cli]:
-  https://github.com/backstage/backstage/blob/master/packages/techdocs-cli
+[techdocs/container]: https://github.com/backstage/techdocs-container
+[techdocs/cli]: https://github.com/backstage/techdocs-cli

docs/features/techdocs/concepts.md

@@ -23,7 +23,7 @@ The TechDocs container is a Docker container available at
 pages, including stylesheets and scripts from Python flavored Markdown, through
 MkDocs.
 
-[TechDocs Container](https://github.com/backstage/backstage/blob/master/packages/techdocs-container/README.md)
+[TechDocs Container](https://github.com/backstage/techdocs-container)
 
 ### TechDocs publisher