Fix Environment Variables Issue

[AtelyPham]

Summary of changes

• Move all env vars to root environment variable file
• Prefixed bridge dapp environments variable by (BRIDGE_DAPP_ for scoping the env variables)
• Load bridge dapp-specific env vars in webpack

Proposed area of change

Put an x in the boxes that apply.

• apps/bridge-dapp
• apps/hubble-stats
• apps/stats-dapp
• apps/webbsite
• apps/faucet
• apps/tangle-website
• libs/webb-ui-components

Reference issue to close (if applicable)

• Closes NaN

[drewstone]

LGTM

[drewstone]

Build failed @AtelyPham

[AtelyPham]

Build failed @AtelyPham

The comment-on-pr GitHub action encountered issues while running on both v1.3.0 and v1.3.1. You can find more details in this issue. I've already addressed this problem in Linh's PR, but this fix only applies to the Hubble Stats DApp. Please extend this fix to all deploy preview apps.

[github-actions]

✅ Deploy Preview for bridge-dapp development is ready! Thanks for the contribution @AtelyPham

Name	Link
🔨 Latest commit	9e0d0e8c527934524a570dff1c4f8af10c54aa4d
🔍 Latest deploy log	https://app.netlify.com/sites/development-hubble-bridge/deploys/64c1578c5a7e6628f507dadd
😎 Deploy Preview	https://64c1578c5a7e6628f507dadd--development-hubble-bridge.netlify.app

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[github-actions]

✅ Deploy Preview for webb faucet is ready! Thanks for the contribution @AtelyPham

Name	Link
🔨 Latest commit	9e0d0e8c527934524a570dff1c4f8af10c54aa4d
🔍 Latest deploy log	https://app.netlify.com/sites/webb-faucet/deploys/64c158e3416103255e512ea7
😎 Deploy Preview	https://64c158e3416103255e512ea7--webb-faucet.netlify.app

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