docs: updated build badges to github actions links (#209)

Author: fmartingr

README.md

@@ -1,4 +1,7 @@
-# Plugin Starter Template [![CircleCI branch](https://img.shields.io/circleci/project/github/mattermost/mattermost-plugin-starter-template/master.svg)](https://circleci.com/gh/mattermost/mattermost-plugin-starter-template)
+# Plugin Starter Template
+
+[![Build Status](https://github.com/mattermost/mattermost-plugin-starter-template/actions/workflows/ci.yml/badge.svg)](https://github.com/mattermost/mattermost-plugin-starter-template/actions/workflows/ci.yml)
+[![E2E Status](https://github.com/mattermost/mattermost-plugin-starter-template/actions/workflows/e2e.yml/badge.svg)](https://github.com/mattermost/mattermost-plugin-starter-template/actions/workflows/e2e.yml)
 
 This plugin serves as a starting point for writing a Mattermost plugin. Feel free to base your own plugin off this repository.