apollo_config: simplify README wording per Orwell style rules

[dan-starkware]

Prose-only edits to crates/apollo_config/README.md, applying Orwell's writing rules. No facts, numbers, or names changed.

• Line 5: cut marketing filler (flexible and powerful, specifically, easily, additional) and replaced jargon leveraging → using.
• Line 20: streamlining → simplifying (everyday word).
• Line 22: cut the process of and the cliché out-of-the-box.

🤖 Generated with Claude Code

https://claude.ai/code/session_01GjrAzEXJmrgsDjg9YSA1c6

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Generated by Claude Code

[cursor]

PR Summary

Low Risk
README-only wording changes with no runtime, security, or configuration impact.

Overview
Documentation-only edits to crates/apollo_config/README.md—no behavior or API changes.

The intro drops marketing filler (flexible and powerful, specifically, easily, additional) and swaps leveraging for using. The pointers bullet uses simplifying instead of streamlining, and the CLI parser bullet trims the process of and the out-of-the-box cliché in favor of it's ready to use.

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[reviewable-StarkWare]

This change is