ci: replace Travis with GitHub Actions

Change-Id: I6316bc7872fe25644dceafb1e2e2119c9c6e5ac3
diff --git a/README.md b/README.md
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--- a/README.md
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 # NLSR: Named Data Link State Routing Protocol
 
-![Language](https://img.shields.io/badge/C%2B%2B-14-blue.svg)
-[![Build Status](https://travis-ci.org/named-data/NLSR.svg?branch=master)](https://travis-ci.org/named-data/NLSR)
-![Latest Version](https://img.shields.io/github/tag/named-data/NLSR.svg?color=darkkhaki&label=latest%20version)
+[![CI](https://github.com/named-data/NLSR/actions/workflows/ci.yml/badge.svg)](https://github.com/named-data/NLSR/actions/workflows/ci.yml)
+[![Docs](https://github.com/named-data/NLSR/actions/workflows/docs.yml/badge.svg)](https://github.com/named-data/NLSR/actions/workflows/docs.yml)
+![Language](https://img.shields.io/badge/C%2B%2B-14-blue)
+![Latest version](https://img.shields.io/github/v/tag/named-data/NLSR?label=Latest%20version)
 
 For complete documentation and more extensive information,
 please visit the [NLSR homepage](https://named-data.net/doc/NLSR/current/).