docs: update the docs to fhevm06

[poppyseedDev]

Closes #531
Closes #523
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Closes #497
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This PR significantly improves the developer documentation to make it more developer-friendly by addressing gaps, adding clarity, and enhancing usability. The following changes have been introduced:

Key Improvements

• Developer-Focused Enhancements: Concepts that were previously unexplained are now clarified.
• Reorganization: Sections have been rearranged for better flow and readability.
• Visual Aids: Diagrams are added to simplify complex ideas.
• Expanded Examples: New and updated code examples are provided to illustrate key concepts.

---

Section Updates

Welcome to fhEVM

• No changes.

Getting Started

• Quick Overview:

  • Key concepts and features are now consolidated here for easier access.
  • The list of repositories has been moved to this section.
  • Includes a reference to the whitepaper (pending an update).

• Get Started:

  • DevNet details have been streamlined and replaced with Ethereum deployment instructions.

• Create a Smart Contract:

  • Updated the Hardhat guide to ensure compatibility with fhEVM v0.6.
  • Formatting improvements.

---

Fundamentals

Focuses on explaining core concepts and critical features with clear explanations and examples.

• Architecture Overview:

  • Provides a high-level understanding of fhEVM architecture.
  • No code examples, focusing instead on concepts.

• Encryption, Decryption, Re-encryption, and Computation:

  • Explains these fundamental concepts with accompanying diagrams for better understanding.

• Access Control List (ACL):

  • High-level overview without detailed code.

---

Configuration

Practical guidance on setting up and configuring smart contracts for encrypted operations.

• First Smart Contract:

  • Includes a simple counter contract example with detailed explanations.

• Supported Types:

  • Lists all supported encrypted types.

• Operations on Encrypted Types:

  • Detailed documentation of all supported operations on encrypted types.

• Encryption:

  • Encrypted input implementation with a code example.

• Decryption:

  • Provides a code example for decryption.

• Decryption in Depth:

  • Explains advanced considerations and edge cases for decryption.

• Re-encryption:

  • Includes code examples demonstrating re-encryption workflows.

• ACL Examples:

  • Detailed ACL implementations and use cases with code examples.

---

Guides

Focuses on supplemental concepts and best practices for smart contract development.

• Smart Contracts:

  • Topics include common pitfalls, conditional statements, FHE branching, random number generation, gas estimation, and error handling.

• Frontend:

  • Covers frontend-related topics, including application building, Node.js integration, CLI usage, and handling common Webpack errors.

---

Tutorials

• See All Tutorials:
  • Provides a centralized list of tutorials.

---

References

• Smart Contracts - fhEVM API:

  • Updated for the latest version.

• Frontend - fhevmjs Library:

  • No updates yet.

---

Developer

• Contributing:

  • Added a link to the bounty program.

• Development Roadmap:

  • Updated to reflect the latest milestones.

• Feature Request and Bug Report:

  • Links updated for improved usability.

• Release Notes:

  • Unchanged.

---

Future TODOs

• Update the whitepaper to the latest version.
• Expand deployment instructions for Sepolia.
• Upgrade the Remix guide to match the latest version.
• Update the frontend development section.

[PacificYield]

It might be useful to link to the explanation of what is transient storage https://eips.ethereum.org/EIPS/eip-1153

[poppyseedDev]

It's mentioned a bit above (line 41)

| Transient | Temporary access during a transaction. | Transient storage (EIP-1153) | Calling external functions or computations with ciphertexts. Use when wanting to save on gas costs. |

[immortal-tofu]

Regarding whitepaper, we agree on keeping the previous whitepaper and adding fhevm-whitepaper-v2.pdf next to it

[immortal-tofu]

Run npm run prettier to fix prettier issue (and install prettier in VSCode ;))

[poppyseedDev]

@yuxizama ready for your review :)