refactor: migrate numeral to numbro

[rickstaa]

This pull request deprecates the use of the unmaintained numeral-js library and replaces it with the numbro. This was done to fix #236 and ensure the explorer is future-proof.

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[rickstaa]

I conducted a swift review to ensure the proper display of all Explorer formats, addressing changes resulting from recent library updates. I corrected the discrepancies I identified but encountered two outstanding tasks:

• Overview Widget and API Key: I couldn't edit the .env file to include the correct API key for the overview widget. This requires attention to ensure its functionality.

• Testing Wallet Display: The widgets are shown when a wallet contains LPT and stakes or un-stakes at an orchestrator needs verification. Unfortunately, the absence of a CONTRIBUTING.md in this repository has left me seeking guidance on the optimal testing approach for these changes. I attempted to find a Goerli LPT test faucet but came up empty 🤔.

I would appreciate any insights or guidance you can give me on testing procedures 🙂.

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[0xcadams]

The build is failing - this may fix it

[0xcadams]

Thanks for this! Some changes we can hopefully make here

[0xcadams]

Hey @rickstaa it looks like this broke the explorer, I had to revert

[rickstaa]

Hi @0xcadams,

No problem at all. As mentioned in this comment, I apologize for not thoroughly testing all parts of the explorer before submitting it. In hindsight, I should have kept it as a draft. I understand the inconvenience it caused 😅.

I'd happily create a new pull request to test all changes thoroughly. However, I could use some guidance on the best testing practices for all my changes. Specifically, there are two areas of the explorer that I couldn't test:

1. Overview Widget: as you've noticed, this widget is currently broken in your screenshot. I couldn't configure the .env file with the correct API key to make the overview widget function properly.

2. Testing Wallet Display: The widgets appear when a wallet contains LPT and stakes or unstakes at an orchestrator, and this part of the code needs verification. Unfortunately, the absence of a CONTRIBUTING.md file in this repository has left me uncertain about the best approach for testing these changes. I attempted to find a Goerli LPT test faucet but could not locate one 🤔.

Your guidance on how to effectively test these changes would be greatly appreciated.