[CON-659] General audit

[0xsergen]

• Auditing EVM-related and/or Quicknode product-related apps
• Implementing rebranding
• New README and CONTRIBUTING files
• Pre-commit script to keep the project directory in README updated

---

Note

Rebranding & Docs refresh

• Standardizes "Quicknode" naming across the repo; updates numerous READMEs and comments
• Adds CONTRIBUTING.md; overhauls root README.md with badges and auto-generated project directory
• Adds/updates READMEs for Streams and multiple sample apps; minor copy/links fixes

Feature/UX updates

• Enhanced enhanced-apis/NFT-Collection-Explorer pages: input validation, loading/error states, formatted balances, accessibility tweaks, updated styles, and tsconfig JSX set to react-jsx
• Fixes RPC param shapes for custom QN methods and adds safer formatting/utilities

Removals & misc

• Removes deprecated enhanced-apis/get-receipts-by-address example
• Minor string/message tweaks across AI agent and other samples; env examples adjusted

^{Written by Cursor Bugbot for commit ba723f9. This will update automatically on new commits. Configure here.}

[mikejhale]

@0xsergen Made a few minor suggestions.

[mikejhale]

Looks good to me!