Minor tweaks to README and ex_doc configuration

Summary:
* Set `README` as the documentation entry point
* Include `LICENSE` file in `ex_doc` documentation
* Add explicit copyright to `README`
* Add links to terms of use and privacy policy
* Remove link to Contributing section (contribution guidelines live in `.github` and are already rendered by GitHub
* Remove obsolete reference to release process

Reviewed By: alanz

Differential Revision: D85038135

fbshipit-source-id: e6126f8ac25effce189d2d0ec0f35a779fc423ad

Author: robertoaloi

README.md

@@ -149,12 +149,14 @@ To add `assert` to your rebar3 project, simply add it to the `deps` in your `reb
 
 `assert` requires Erlang/OTP 26.
 
-## Join the assert community
-See the [CONTRIBUTING](CONTRIBUTING.md) file for how to help out.
+## License
+`assert` is Apache 2.0 licensed, as found in the [LICENSE](LICENSE.md) file.
 
-## Release Process
+## References
 
-The [release process](./RELEASE.md) requires a few steps, updating the [CHANGELOG.md](./CHANGELOG.md), releasing to [hex](https://hex.pm/packages/erlfmt) and more.
+* [Terms of Use](https://opensource.fb.com/legal/terms)
+* [Privacy Policy](https://opensource.fb.com/legal/privacy)
 
-## License
-`assert` is Apache 2.0 licensed, as found in the [LICENSE](LICENSE.md) file.
+## Copyright
+
+Copyright © Meta Platforms, Inc

rebar.config

@@ -50,3 +50,8 @@
 
 % We select `ex_doc` as the documentation provider. This renders documentation in Elixir style, as opposed to the old Erlang EDoc style.
 {hex, [{doc, ex_doc}]}.
+
+{ex_doc, [
+    {extras, [~"README.md", ~"LICENSE.md"]},
+    {main, ~"README.md"}
+]}.