README: clarify deprecation and point to modules

See golang/go#38158.

README.md

@@ -5,18 +5,13 @@
   <a href="https://goreportcard.com/report/github.com/golang/dep"><img src="https://goreportcard.com/badge/github.com/golang/dep" /></a>
 </p>
 
-<i>Would you like to see your company name here? <a
-href="https://github.com/golang/dep/issues/2165">We're looking for a stable source of
-funding.</a></i>
-
 ## Dep
 
 `dep` is a dependency management tool for Go. It requires Go 1.9 or newer to compile.
 
-`dep` was initially developed to experiment with a new dependency management system
-for Go; but, as of Go 1.11, **the Go project has officially adopted a different approach, 
-based on the concept of Modules**, which is described in a [series of posts](https://blog.golang.org/using-go-modules) 
-published on [blog.golang.org](https://blog.golang.org).
+**NOTE:** Dep was an official experiment to implement a package manager for Go.
+As of 2020, Dep is deprecated and archived in favor of Go modules, which have
+had official support since Go 1.11. For more details, see https://golang.org/ref/mod.
 
 For guides and reference materials about `dep`, see [the documentation](https://golang.github.io/dep).
 
@@ -58,19 +53,3 @@ install via `go get`:
 ```sh
 go get -u github.com/golang/dep/cmd/dep
 ```
-
-## Feedback
-
-Feedback is greatly appreciated.
-At this stage, the maintainers are most interested in feedback centered on the user experience (UX) of the tool.
-Do you have workflows that the tool supports well, or doesn't support at all?
-Do any of the commands have surprising effects, output, or results?
-Let us know by filing an issue, describing what you did or wanted to do, what you expected to happen, and what actually happened.
-
-## Contributing
-
-Contributions are greatly appreciated.
-The maintainers actively manage the issues list, and try to highlight issues suitable for newcomers.
-The project follows the typical GitHub pull request model.
-See [CONTRIBUTING.md](CONTRIBUTING.md) for more details.
-Before starting any work, please either comment on an existing issue, or file a new one.

docs/introduction.md

@@ -3,6 +3,10 @@ id: introduction
 title: Getting Started
 ---
 
+**NOTE:** Dep was an official experiment to implement a package manager for Go.
+As of 2020, Dep is deprecated and archived in favor of Go modules, which have
+had official support since Go 1.11. For more details, see https://golang.org/ref/mod.
+
 Welcome! This is documentation for dep, the "official experiment" dependency management tool for the Go language. Dep is a tool intended primarily for use by developers, to support the work of actually writing and shipping code. It is _not_ intended for end users who are installing Go software - that's what `go get` does.
 
 This site has both guides and reference documents. The guides are practical explanations of how to actually do things with dep, whereas the reference material provides deeper dives on specific topics. Of particular note is the [glossary](glossary.md) - if you're unfamiliar with terminology used in this documentation, make sure to check there!