feat: expose RPC env vars, make subgraph URLs optional, fix README env vars

[MantisClone]

Merge #50 before this Towards https://github.com/RequestNetwork/private-issues/issues/89

Changes

• Expose RPC Env Vars to be configurable
• Make Subgraph URLs optional by adding defaults
• Remove Payments Subgraph URLs for Near, Near Testnet, Tombchain, and Ronin
  • Near and Near Testnet are not supported by this app currently
  • Tombchain and Ronin payment subgraph URLs don't work
• Clean up the README so that "required/optional" is correct for all env vars

Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Expanded support for additional blockchain networks, including Arbitrum One, Avalanche, Base, and more, enhancing wallet connectivity options.
  • Introduced Google Tag Manager integration for improved analytics and tracking capabilities.

• Documentation

  • Updated environment variable documentation to reflect changes in required status, providing more flexibility for deployment.

• Bug Fixes

  • Implemented fallback URLs for payment subgraph URLs to ensure functionality even when environment variables are not set.

[coderabbitai[bot]]

[!CAUTION]

Review failed

The pull request is closed.

Walkthrough

The changes involve updates to the .env.example, README.md, utils/connectWallet.ts, and utils/initializeRN.ts files. Key modifications include the addition of new RPC URLs and payment subgraph URLs for various blockchain networks, a reorganization of environment variable declarations, and the introduction of fallback mechanisms for payment subgraph URLs. The documentation reflects these updates by altering the status of certain environment variables from required to not required.

Changes

Files	Change Summary
.env.example, README.md	Updated environment variable declarations for RPC URLs and payment subgraphs, with new entries added and existing ones commented out. The status of several variables changed from required (✅) to not required (❌).
utils/connectWallet.ts	Expanded the onboardConfig object to include new blockchain networks (Arbitrum One, Avalanche, Base, etc.) and replaced the existing Polygon entry with xDai.
utils/initializeRN.ts	Enhanced the initializeRequestNetwork function to include fallback URLs for payment subgraph URLs, ensuring functionality even when environment variables are not set.

Possibly related PRs

• 51: The changes in this PR involve significant modifications to the .env.example file, including the addition of new RPC URLs and payment subgraph URLs, which directly relate to the updates made in the main PR.

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