[github] badges for the github actions

Summary:
We've switched away from Travis CI to github actions more than a year
ago but forgot to update the badge in the README.

Reviewed By: ezgicicek

Differential Revision: D31141763

fbshipit-source-id: 575566854

.github/workflows/deploy.yml

@@ -1,4 +1,4 @@
-name: Deploy
+name: website
 
 on:
   push:

.github/workflows/install.yml

@@ -1,4 +1,4 @@
-name: Install
+name: build
 
 on:
   - push

README.md

@@ -1,6 +1,6 @@
 <img src="website/static/img/logo.png" alt="logo" width="15%" />
 
-# Infer [![Build Status](https://travis-ci.org/facebook/infer.svg?branch=main)](https://travis-ci.org/facebook/infer)
+# Infer ![build](https://github.com/facebook/infer/actions/workflows/install.yml/badge.svg) ![website](https://github.com/facebook/infer/actions/workflows/deploy.yml/badge.svg)
 
 [Infer](http://fbinfer.com/) is a static analysis tool for Java,
 C++, Objective-C, and C. Infer is written in [OCaml](https://ocaml.org/).