Refactor/repo documentation

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Reviewing files that changed from the base of the PR and between fec655687f1be65751c924a82de3c0fe811d480e and bc4ad3b558b0db0d0936e3b97f771f223e543ffc.

Walkthrough

The pull request introduces extensive modifications to several documentation files related to the EVM Query Language (EQL). Key changes include the enhancement of the README.md file with new sections such as "Overview," "Why EQL?," and "How It Works," which clarify EQL's purpose and functionality. The REPO_STRUCTURE.md document has been revised to improve descriptions of directory contents, while productions.pest updates grammar rules for data retrieval commands. Additionally, new installation and configuration guidance is provided in installation.md, along with a comprehensive Query Syntax Guide in query.md.

Changes

File	Change Summary
`README.md`	Title updated to include "EQL"; new sections added: "Overview," "Why EQL?," "How It Works," "Quick Start," "Features," "Roadmap," "Contributing," "License." Goals section removed.
`REPO_STRUCTURE.md`	Updated descriptions for `/crates` directories; terminology changed in `/crates/cli`; file names clarified in `/crates/core`; new "Installation & Configuration" section added.
`crates/core/src/interpreter/frontend/productions.pest`	Grammar rules updated: "yaml" and "toml" removed from `file_format`; new `chain_selector` rules added.
`docs/installation.md`	New sections for "Installation," "Configuration," "Pre-configured Networks," "Verify Installation"; JSON configuration structure introduced for `~/eql-config.json`.
`docs/query.md`	New document added: comprehensive Query Syntax Guide with sections on syntax, entity identifiers, WHERE clause, file exports, and limitations.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant EQL_Interpreter
    participant RPC_Provider

    User->>EQL_Interpreter: Submit EQL Query
    EQL_Interpreter->>RPC_Provider: Transform Query to RPC Call
    RPC_Provider-->>EQL_Interpreter: Return Data
    EQL_Interpreter-->>User: Present Query Results

🐰 "In the land of code, where queries bloom,
EQL now shines, dispelling the gloom.
With sections anew, and clarity bright,
Our documentation's ready, a true delight!
So hop along, dear users, take a peek,
The magic of EQL is here, so unique!" 🌟

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iankressin / eql