Fix README instructions, update links and Node.js references in examples

[beck042]

Description

This PR includes several improvements and fixes across the TypeScript examples:

1. Correct non-existent directory in README

   • Replaced typescript/examples/langchain-cdp-v2-chatbot with typescript/examples/langchain-cdp-chatbot in README.md.
   • Removed references to langchain-cdp-v2-chatbot in Contributing.md.

2. Add proper license links

   • Updated all example READMEs to link to the LICENSE file (../../../LICENSE.md) instead of just stating "Apache-2.0".

3. Update Node.js references

   • Replaced plain text Node.js 18+ with a clickable link: [Node.js 18+](https://nodejs.org/en/download/current).

These changes improve clarity for users following setup instructions, ensure links are accurate, and standardize license references across examples.

Checklist

A couple of things to include in your PR for completeness:

• Added documentation to all relevant README.md files
• Added a changelog entry

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[phdargen]

Thanks for the fixes @beck042