Format local development instructions (outline#2007)

Author: iamsaumya

README.md

@@ -85,9 +85,9 @@ yarn run upgrade
 For contributing features and fixes you can quickly get an environment running using Docker by following these steps:
 
 1. Install these dependencies if you don't already have them
-  1. [Docker for Desktop](https://www.docker.com)
-  1. [Node.js](https://nodejs.org/) (v12 LTS preferred)
-  1. [Yarn](https://yarnpkg.com)
+    1. [Docker for Desktop](https://www.docker.com)
+    1. [Node.js](https://nodejs.org/) (v12 LTS preferred)
+    1. [Yarn](https://yarnpkg.com)
 1. Clone this repo
 1. Register a Slack app at https://api.slack.com/apps
 1. Copy the file `.env.sample` to `.env`