Added Makefile for explorer.

[samoht9277]

Makefile for explorer

Description

Adds a makefile for building and deploying the explorer

Type of change

• [x] New feature

Checklist

• [ ] “Hotfix” to testnet, everything else to staging
• [ ] Linked to Github Issue
• [ ] This change depends on code or research by an external entity
  • [ ] Acknowledgements were updated to give credit
• [ ] Unit tests added
• [ ] This change requires new documentation.
  • [ ] Documentation has been added/updated.
• [ ] This change is an Optimization
  • [ ] Benchmarks added/run
• [ ] Has a known issue
  • Link to the open issue addressing it
• [ ] If your PR changes the Operator compatibility (Ex: Upgrade prover versions)
  • [ ] This PR adds compatibility for operator for both versions and do not change batcher/docs/examples
  • [ ] This PR updates batcher and docs/examples to the newer version. This requires the operator are already updated to be compatible