chore: fix missing source-maps & reduce bundle size

[reznord]

Context

Earlier in #772 , I have disabled source-maps temporarily for suppressing the warnings in the console.

Problem Statement

But that disabled source-maps overall for the entire gardens project and it is a bit hard to debug UI issues since it will point to the transpiled code.

Solution

This PR fixes the missing source-maps warnings and enables source-maps which would allow us for easy debugging over-all.

Also, apart from that, I installed fork-bn.js and aliased all the bn.js chunks in the bundle to the fork-bn.js. This allowed us to trim off ~46kB from the main bundle.

Note:

Please follow the below mentioned steps for testing:

• Remove node_modules & build folders: rm -rf node_modules build
• Install depenedencies yarn install or yarn
• Run the project in development / production mode.

Images

Before:

After:

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[tmoutinho]

LGTM!